urbpan: (dandelion)
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Nature walk participant Keith pointed them out to me. "Fairy pins!" he said. I suddenly wished I had my reading glasses with me. With the naked eye I could see only the greenish white surface of the Trichaptum biforme*, a superabundant thin polypore mushroom. But through the loupe (good thing for a naturalist to carry) I could see the miniscule burnt matchsticks of Phaeocalicium polyporaeum.** These tiny mushrooms are the fruiting body of a fungus that parasitizes the Trichaptum biforme.
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*Double-formed, bound in hairs

**Dark buds of polypore
urbpan: (dandelion)
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The rubbery brown cauliflower-like thing you see is the fruiting body of the Tremella foliacea* fungus. I am not sure that I had seen it before encountering it multiple times last Sunday on the Urban Nature Walk. The fungus is a parasite that feeds on another fungus.

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You can see the mushroom of the parasite surrounded by the mushroom of the host. The little orangish mushrooms belong to Stereum hirsutum**, a very common wood-digesting fungus. Like VERY common--I could find it anywhere there are trees if you gave me 5 minutes. So why haven't I seen the parasite before? Dunno, but now that I'm aware of it, I bet you I'll see it all the time. Mushrooms have a way of hiding in plain sight, waiting for you to realize they were there all along.


*Trembling foliage

**Hairy and hard (Oh grow up)
urbpan: (dandelion)
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When someone asks, as they always eventually do, "why do mosquitoes exist?," they're really asking another hidden question. Because mosquitoes exist for the same reason all organisms exist: evolution provided adaptations to fit the available energy sources. Blood-suckers suck blood because blood is a liquid that can be sucked--the alternative is flesh-eating. Which is worse?

The hidden question is this "Is the natural world in balance?" The answer of course is no. Humans have proved to be so adaptable in such a short time, that we have thrown the entirety of the rest of the natural world out of kilter. We have spread to every corner of the globe, bringing our food animals with us. We have created vast climate-controlled structures to live in. We have dug deep into the earth to find energy trapped in hydrocarbons that have held onto it for millions of years, and released so much carbon dioxide into the atmosphere that we have changed the atmosphere and climate of the planet forever.

One of the most mundane activities of humans--the selling of goods between one land mass and another--has resulted in the spread of mosquitoes. In prehistory the mosquitoes would have lived in balance with their predators--the mosquitoes pushing their hosts gently toward fitness, the predators keeping them at a tolerable level. Moving mosquitoes around the world has brought these biting flies to land masses that never had them before, and brought multiple species to places that used to have only a few species. The shiploads of tires and other mosquito-moving industries did not bring along the predators of the mosquitoes. We ask too much of our native bats and dragonflies--there are simply too many exotic mosquitoes for natural controls to retake the balance.

The result is blood-borne diseases in North America bearing the names of regions in Africa. The result is the almost complete destruction of Hawaain bird diversity. The result is mosquitoes that bite in the daytime, that breed in dumpsters and dirty gutters, in densities that mock the equilibrium of the past. Why are there mosquitoes? Because there is blood to drink. Why are there so many god damned mosquitoes? Because human activity creates and destroys habitat in a way that rarely makes the world a better place.

Mosquito=little fly
Mosquito family Culicidae=family of little flies
urbpan: (dandelion)
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Some people don't like parasites, but what if the parasite is large and colorful and delicious? Many people seem to love Laetiporus sulphureus*, especially foragers who may scan forests looking for their beloved "chickens," perched high on an oak tree. The oak tree, if it could express a preference, probably would rather not have this fungus in its heartwood, breaking down hemicellulose and cellulose and digesting the results. By the time the mushrooms have appeared, the fungus has been in the wood for years. The fungus continues to feed even if the tree falls down and dies.

This species has the distinction of holding the record for most massive single mushroom--actually a fused collection of shelves--more than a hundred pounds. The forager who found it managed to cut some 70 pounds down to bring home.
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* Laetiporus means with bright pores and sulphureus means the colour of sulphur.
urbpan: (dandelion)

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Bondarzewia berkeleyi* is a mushroom so big that photographers traditionally place hats on it for scale. The greater part of the fungus is hard at work digesting "moist, poorly protected undersurface of tree trunk's thickest part" causing a disease called "butt rot," undoubtedly named by 12 year old with a forestry degree. Despite looking for all the world like a polypore mushroom, "Big Berk" is more closely related to Russula producing fungi. Future mushroom field guides are going to have to make a choice between grouping together species that look alike or species that are actually closely related.

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* Bondarzewia is named for A.S. Bondarzew; berkeleyi is named for British mycologist M. J. Berkeley (1803-1889).

urbpan: (dandelion)
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Two different mushrooms on the ground, no big deal, right? But if you get flat on the ground to examine them (as you do--well I do, sorry if you don't swing that way) you'll notice that they have some similarities. In fact, I'm pretty sure they're the same species--two mushrooms from the same underground mycelium. What accounts for the difference? Why, a parasite, of course.

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Plant ID

Jul. 5th, 2015 08:50 pm
urbpan: (dandelion)
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As Alexis and I were walking the dogs through the Lost Pond Reservation last week, she stopped and said, hey, what are these flowers? I looked and said that they're kind of wintergreen. Then somewhere in the back of my brain the word "pipsissewa" spoke up. That turns out to be true, but since I didn't have conscious access to the process, I'm not sure I can use it to my future advantage with plant identification.

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Pipsissewa is the name given by the Cree, indigenous people of what is now Canada. The plant, Chimaphila umbellata*, has a number of uses including treating urinary disorders and fever and to flavor root beer. Despite having chlorophyll in its leaves to photosynthesize, this plant derives some of its nutrients by parasitizing mycorrhizae, in the same way as strictly parasitic plants like monotrope.

* "Umbellate** winter-lover"

** Umbellate refers to a type of flower growth, ie: in umbels. Umbels are a type of flower wherein a number of flower stalks radiate from a common origin. The most familiar umbellate wildflower is Queen Anne's Lace Dauca carota***.

*** "carrot carrot"
urbpan: (dandelion)
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The eastern subspecies of the Tree Octopus Octopus paxarbolis* turns out, under sober reflection, to be a fungus. Specifically, it is the gall of a fungus with an interesting two host life cycle. The gall overwinters as a woody knob on an eastern red cedar Juniperus virginiana** but when the warm spring rains come, out come the tentacles. The jelly protuberances release spores into the air, which can infect a number of plants in the rose family (including, for economically important reasons, apple treesMalus sp.***).

Once inside the second host, the cedar-apple rust Gymnosporangium juniperi-virginianae**** grows until it forms pustules on the leaves and fruit. Orange rust-like growths produce spores that then must infect a red cedar to continue the cycle. The fungus doesn't usually seriously harm it's hosts, but consumers don't like to buy hand fruit with pustules on them, I guess.

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* "Eight-footed Pacific Tree-dweller"

** "Virginia juniper"

*** "Apple" Jesus do I have to do everything?

**** "Naked spore vessel on eastern red cedar"
urbpan: (dandelion)
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My coworker Jason flagged me down. He had an unhappy expression on his face and a piece of paper in his hand. On the paper was not words, but a female Dermacentor variablis*, what we usually call a dog tick or a wood tick. "Picked this off of me," he said grimly. I got excited about having a specimen to photograph, so much so I almost forgot to say what we always do when this happens, "At least it wasn't a deer tick."

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Sure, dog ticks spread Rocky Mountain Spotted Fever and tularemia, but when was the last time you heard of someone catching one of those? But I can't think of a single New Englander I know who doesn't have a friend or family member who has experienced Lyme disease, or had it themselves. I almost feel warmly toward Dermacentor ticks, on account of how much loathing their smaller cousins the Ixodes** ticks inspire.

* "Variable skin-pricker."

**Greek ixos(ιξος)- "birdlime" (a sticky substance put on places where birds perched in order to trap them) + -odes (-ωδης)- a variant of -oides(οιδης)- "like, resembling" (only seen as an ending).
urbpan: (dandelion)
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After a short walk through my suburban neighborhood--including a wooded easement next to a cemetery--I sat in my kitchen texting my wife. Suddenly the eight-legged silhouette of the pictured animal crossed the backlit screen. It appeared that I was the next step of the journey for a "questing" blacklegged tick Ixodes scapularis (more popularly called a deer tick).

Previous to crawling on me, she had crawled to the edge of the twig of a shrub, reaching (questing) with her front legs, smelling the carbon dioxide I was emitting, and sensing my body heat. Previous to that she had endured the long winter, possibly under the seven feet of snow, under a warm decomposing layer of leaf litter. She may have just recently become an adult--not long ago she was a tiny nymph the size of a poppy seed, clinging to the creature that provided the meal that allowed her to grow and shed her exoskeleton.

We don't know what creature it was that served as her past home and meal ticket, but we know it was warm blooded. Chances are very good that it was a white footed mouse, in which case she was also very likely to be carrying the bacteria that cause Lyme disease, Babesiosis, or Anaplasmosis. If as a nymph she fed on a white tailed deer--less likely, since nymphs tend to stay low and feed on smaller creatures--then she would be rather more unlikely to carry these pathogens, especially Lyme disease. If her previous host was an opossum, she would have been among the lucky 10 percent that made it past the North American marsupial's diligent groom-and-eat regimen.

Females are identifiable by the large amount of red colored body not covered by the scutum, or dorsal shield. The scutum provides protection, but also is inelastic, and these blood-feeders need to be able to expand their body to accumulate the massive meal they need to produce their eggs. Males take smaller meals and are more fully covered by the scutum, making them look smaller and darker.

After I took this picture I removed this tick from the food web--they are an overabundant species causing serious human and animal health problems. I also reported it to TickEncounter.com like a good citizen scientist.
urbpan: (dandelion)

280 days of Urbpandemonium #6: On our urban nature walk we tried to identify a shrub: it looked like a blueberry bush but was very tall. This gall confirmed our suspicions. This was the nursery for a bunch of tiny blueberry stem gall wasps,Hemadas nubilipennis. The tiny gravid wasp lays her eggs in the stem of the blueberry, which causes this woody growth to envelop and protect them.

The many little holes on the outside of the gall are the exit holes of the young, who grew to adulthood inside, and chewed their way out as grown wasps to repeat the cycle. Or perhaps the holes were made by a parasitoid wasp: at least four different species of other wasp are known to lay their eggs in the cells of the blueberry stem gall wasp, where their larvae feed on the larvae of the gall-maker, and benefit from the gall’s protection.

urbpan: (dandelion)
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This time around [livejournal.com profile] mizdarkgirl suggested that we walk in the Blakely Hoar Nature Sanctuary in Brookline. We had twice as many people participating as we did January 2014. I took about a million photos, of which I've posted 20 or so:
Read more... )
urbpan: (dandelion)
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"Bootlaces" on a dead tree. These are the mycelial threads that the parasitic fungus Armillaria sp. uses to spread from area to area, colonizing new hosts. Armillaria is a complex of fungi species collectively called "honey mushrooms" for their edible yellow-brown mushrooms.
urbpan: (dandelion)
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My friend [livejournal.com profile] dedhamoutside and I co-led an Urban Nature Walk in the Dedham Town Forest (previously seen here). This sign is relatively new. On the one hand, it's nice for the town to recognize the Town Forest; on the other, now it's more visible for use and abuse. We set out with the intention to find mushrooms and other living things!

Read more... )
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On Sunday the weather started to clear.

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urbpan: (dandelion)
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Behold the fruiting body of the tree parasite Laetiporus cincinnatus, almost luminous in its pink orange glory. This is one of at least two (probably more) polypore mushrooms that have the common name "chicken mushroom." When people ask me if it's edible I tell them, "Oh yes, it's one of our most sought-after edibles. I made myself very sick eating it once." Polypores have sturdy cell walls and need lots of cooking to soften them up into something that weak human intestines can deal with.
urbpan: (dandelion)
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This carpenter bee pupa fell out of its nest--a hole chewed under the handrail of our porch.
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urbpan: (dandelion)
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It looks like it might be a huge biting fly, but don't worry! These big attractive insects parasitize the nests of carpenter bees, but are totally harmless to humans.
urbpan: (dandelion)
It was quite a nice surprise to hear my story of being covered with peacock lice repeated on the Caustic Soda Podcast! If you would like to hear all about lice, with a balance of good science information, dumb jokes, and grossness, listen here. Thanks to lj friend [livejournal.com profile] wirrrn for immortalizing my tale of bird lice in my beard.
urbpan: (dandelion)
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The first time you see a white ibis in Florida it's shocking and magical--aren't they African animals? Didn't the ancient Egyptians mummify them by the million? Then you see a flock of 20 in a drainage ditch. Then you realize you're seeing them basically anywhere there's water. Then, if you're me, you hand-feed them cat food at the zoo.

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