This section is from the book "Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc.", by George Francis Atkinson. Also available from Amazon: Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc..
In the genus Tubaria the spores are rust-red, or rusty brown (ferruginous or fuscous-ferruginous), the stem is somewhat cartilaginous, hollow, and, what is more important, the gills are more or less decurrent, broad next to the stem, and thus more or less triangular in outline. It is related to Naucoria and Galera, but differs in the decurrent gills. The pileus is convex, or with an umbilicus.
This species grows by roadsides in grassy places. The plants are from 3-4 cm. high, and the cap 1-2 cm. in diameter, and the stem 2-3 mm. in thickness.
The pileus is conic, then bell-shaped, often expanded and with a slight umbo; the color is dull, reddish brown, and it has a watery appearance. The plant is sometimes enveloped with a loose and delicate universal or outer veil, which remains on the margin of the cap in the form of silky squamules as shown in the figure. The margin of the pileus is faintly striate. The gills are only slightly decurrent. Figure 153 is from plants (No. 2360 C. U. herbarium) collected along a street in Ithaca.
The stem is at first solid, becoming hollow, tapering above, and the apex is mealy.
Tubaria pellucida. Dull reddish brown (natural size).