On MushroomExpert.Com, find the typical habitat and spore size for 'Agaricus campestris'. Then, locate the spore size for 'Agaricus porphyrocephalus var. pallidus'. Based on this information, identify the primary microscopic feature that distinguishes these two mushroom varieties.
Navigate to MushroomExpert.Com. Use the 'Shortcut.Pl Form' dropdown menu to select and navigate to the 'Agaricus campestris' species page. Extract the typical habitat for Agaricus campestris from the 'Ecology' section. Extract the spore size for Agaricus campestris from the 'Microscopic Features' section. Use the 'Shortcut.Pl Form' dropdown menu to select and navigate to the 'Agaricus porphyrocephalus pallidus' species page. 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.