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 these two mushroom varieties?
Navigate to the Agaricus campestris species page (http://mushroomexpert.com/agaricus_campestris.html). Extract the typical habitat for Agaricus campestris. Extract the spore size for Agaricus campestris. Navigate to the Agaricus porphyrocephalus var. pallidus species page (http://mushroomexpert.com/agaricus_porphyrocephalus_pallidus.html). Extract the spore size for Agaricus porphyrocephalus var. pallidus. Based on the extracted spore sizes, identify the primary microscopic distinguishing feature between the two varieties.
State the typical habitat for Agaricus campestris (e.g., 'meadows, fields, lawns, and grassy areas'). State the spore size for Agaricus campestris (e.g., '6.5–8.5 x 4–5 µm'). State the spore size for Agaricus porphyrocephalus var. pallidus (e.g., '5–6.5 x 3.5–4.5 µm'). Clearly identify spore size as the primary microscopic distinguishing feature between the two varieties.