I'm trying to differentiate between 'Agaricus campestris' and 'Agaricus porphyrocephalus var. pallidus'. For 'Agaricus campestris', what is its typical habitat and spore size? For 'Agaricus porphyrocephalus var. pallidus', what is its spore size? Based on these details, what is the primary microscopic feature that distinguishes them?
Navigate directly to the 'Agaricus campestris' species page: http://mushroomexpert.com/agaricus_campestris.html. Locate and extract the typical habitat for 'Agaricus campestris' from the 'Ecology' section. Locate and extract the spore size for 'Agaricus campestris' from the 'Microscopic Features' section. Click the link on the 'Agaricus campestris' page to navigate to the 'Agaricus porphyrocephalus var. pallidus' species page. Locate and extract the spore size for 'Agaricus porphyrocephalus var. pallidus' from the 'Microscopic Features' section. Compare the extracted spore sizes and identify the primary microscopic feature that distinguishes the two varieties.
State the typical habitat for Agaricus campestris as 'meadows, fields, lawns, and grassy areas'. State the spore size for Agaricus campestris as '6.5–8.5 x 4–5 µm'. State the spore size for Agaricus porphyrocephalus var. pallidus as '5–6.5 x 3.5–4.5 µm'. Clearly identify spore size as the primary microscopic distinguishing feature between the two varieties.