"A patch of spawn arising from a single spore or a number of spores spreads centrifugally in every direction, and forms a common circular felt, from which the fruit arises at its extreme edge; the soil in the inner part of the disc is exhausted, and the spawn dies or becomes effete there, while it spreads all around in an outward direction and produces another crop whose spawn spreads again. The circle is thus continually enlarged, and extends indefinitely until some cause intervenes to destroy it. The peculiarity of growth first arises from a tendency of certain fungi to assume a circular form."
The perplexing mushroom, Hypholoma perplexum, often grows in clusters, and so does the inky Coprinus, C. atramentarius, also the glistening Coprinus, C. micaceus. The honey-colored mushroom, Armillaria melloea, is often found in crowded clusters, and this growth is common to many fungi.
Many mushrooms have distinct odors and are distinguished by this feature. The genus Marasmius may be know