Showing posts with label toxicity. Show all posts
Showing posts with label toxicity. Show all posts

Saturday, October 21, 2023

Ruminating On 'Shrooms


Day 8: When my husband and I inherited his grandparents' small acreage on one of southwest Washington's prairies, we promptly dubbed it "Toadstool Acres" for the numerous varieties of mushrooms growing there. We had morels off the back step in spring, boletas throughout the yard, shaggymanes behind the root cellar, but most notable was the sheer number of Amanitas, especially A. muscaria, which is arguably the most recognizable mushroom in the world with its bright red cap and white spots. Hubby enjoyed daily rambles in our woods, and had noticed that deer seemed to be eating mushrooms with abandon, including the poisonous Amanitas. He asked me how they survived since, like us, deer are mammals. I told him, "I don't know, but I'm not eatin' deer liver. That's where all those toxins go." Since then, I've done my homework, and could give him two reasons: first, deer are ruminants. Their four-chambered stomachs process foods differently, and at least two of the chambers contain bacteria which break down the toxic alkaloids. Second, deer do not gorge on a single food. They are browsers, grazers, and therefore rarely (if ever) consume toxic doses, although amanita poisoning has occasionally been found in cattle.

Here at the foot of the Mountain, my yard also sprouts a fairly wide but different selection of 'shrooms, and again, the deer consume several species which would make a human sick. A few of the species currently fruiting in my yard include a blue-staining bolete (top left, blue-staining varieties cause reactions in some people), Stropharia ambigua (lower left, poisonous), Russula occidentalis (lower right, dubious) and LBMs (top right), those infamous Little Brown Mushrooms which are impossible to identify unless you're an expert, and risky to consume. As one wit put it, "All mushrooms are edible...once." And I'm still not going to eat deer liver (not that I would eat venison anyway).

Sunday, September 30, 2018

Tanacetum Vs. Jacobaea


Day 352: When people hear the word "tansy," they may be referring to plants of either genus, Tanacetum or Jacobaea. Both are toxic to livestock and contain volatile oils which may cause contact dermatitis in sensitive individuals, and both are considered invasive. The plants are easy to tell apart, especially when in bloom. Tanacetum vulgare (Common Tansy, top) has no ray flowers; Jacobaea vulgaris (aka Senecio jacobaea, Tansy Ragwort, bottom) does. The leaves are also distinctly different, although those of Tansy Ragwort can be highly variable, especially when young. The foliage of Common Tansy is fern-like; that of Tansy Ragwort is similar to that of radishes left too long in the garden, and forms a rosette. In Washington, the introduction of Cinnabar Moth (Tyria jacobaea) as a biological control has been fairly successful in reducing the occurrence of Tansy Ragwort, the caterpillars' primary food source. Once they have decimated an infestation of Ragwort, the caterpillars cease reproducing and therefore cannot become a secondary concern.

Wednesday, September 16, 2015

Ramaria



Day 338: Would-be mushroom hunters be warned: while many wild fungi are edible, it often takes chemical testing or microscopic examination of the spores to differentiate one species from another. For example, I know that this is a Ramaria, i.e., one of the Coral fungi often found around Mount Rainier and elsewhere in the forests of the Pacific Northwest. However, it could be R. botrytis, R. subbotrytis, R. formosa or even an aged specimen of R. araiospora, now faded to pink. Your narrator lacks the expertise to tell them apart, and with mushrooms, unless you are "105%" certain of a species identification, erring on the side of caution is mandatory. Many of the Coral fungi contain toxins, and while some people may not react to them, others may respond with mild to severe symptoms of mushroom poisoning. In other words, if you aren't positive of a species, do NOT eat it.

Just as a reminder, per 36 Code of Federal Regulations (CFR) 2.1 with respect to Mount Rainier National Park, "Edible fungi (mushrooms) - collection of the above is for personal consumption and shall be no more than one (1) gallon per person, per day."