Georg Friedrich Wilhelm Meyer

Ocellularia is a genus of lichens in the family Graphidaceae. The genus was circumscribed by Georg Friedrich Wilhelm Meyer in 1825.

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Mycoporum is a genus of fungi which belongs to the family Mycoporaceae, and has cosmopolitan distribution.

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Chlorophyllum molybdites, commonly known as the green-spored parasol, green-gill parasol, false parasol, green-spored lepiota and vomiter, is a common species of mushroom found in temperate and subtropical meadows and lawns. The species is poisonous and causes potentially serious vomiting and diarrhea. It is the most commonly consumed poisonous mushroom in North America, often being misidentified as edible species like Chlorophyllum rhacodes (the shaggy parasol) and Macrolepiota procera (parasol mushroom).

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Pyxine albovirens is a species of foliose lichen in the family Caliciaceae that is found in North America and South America. It was first formally described as a species of Lecidea in 1818 by German botanist Georg Friedrich Wilhelm Meyer. André Aptroot transferred it to the genus Pyxine in 1987. The lichen has lobes with distinctly round, laminal soralia. It contains lichexanthone, a lichen product that causes the cortex to fluoresce bright yellow when lit with a long-wavelength UV light. A chemical spot test of the medulla with an aqueous solution of potassium hydroxide (i.e., the K test) is

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