430 THE AGARICACEAE OF MICHIGAN 



Similar in stature to G. gkibrellus, but differs in the nature of the 

 surface of the pileus both in color and in the structure of the cuticle. 

 As the moisture disappears the umbo fades to pale ochraceous. It 

 agrees well with the figures of Fries at the Stockholm Museum and 

 also with the conception of Ricken. Fries states that the plants are 

 more robust among fallen leaves and the stem is then stout and 

 clavate-bulbous and some of his figures show this. 



445. Cortinarius duracinus Fr. var. 



Epicrisis, 1836-38. 



Illustrations: Cooke, 111., PI. 809 (not typical). 



Ricken, Die Blatterpilze, PI. 51, Fig. 2 (not typical). 

 Quelet, Grevillea, Vol. VII, PL 115, Fig. 1 (dry form). 



PILEUS 4-10 cm. broad, convex then expanded, obtuse, sometimes 

 gibbous, hygrophanous, watery cinnamon-proton when moist, tinged 

 rufous on disk, pale ochraceous-tan to buff when dry, glabrous, even, 

 margin at first incurved then geniculate and obsoletely silky. 

 FLESH rigid-brittle, thin, scissile, concolor, at length pallid. 

 GILLS adnate or slightly subdecurrent, thin, subdistant, moderately 

 broad, pallid at first but soon watery-cinnamon, edge even or scarce- 

 ly crenulate. STEM 4-12 cm. long, tapering downwards or fusi- 

 form-subradicate, 6-15 mm. thick, glabrous, rigid, stuffed then hol- 

 low, sometimes compressed, at length shining, ivhite, at first corti- 

 nate-fibrillose. CORTINA white. SPORES elliptical-almond-shaped, 

 scarcely rough, 7-9.5 x 5-5.5 inicr. BASIDIA 32-36 x 8-9 micr. 

 ODOR and TASTE mild. 



Gregarious, often in troops or subcaespitose. Ou the ground, 

 grassy places, etc., in frondose woods of southern Michigan. Aug- 

 ust to October. Frequent in very wet weather. 



One of the larger Hydrocybes, usually found in quantity when 

 it occurs. No good plates seem to exist of the plant as it occurs 

 with us. Our specimens agree in stature, colors, spores, etc., with a 

 collection I found at Stockholm. Ricken gives spores much larger, 

 but Massee's spore-measurements are much smaller. It seems clear 

 that the species of Fries is yet uncertain. A plant agreeing in the 

 spore-character with that of Ricken and otherwise similar to the 

 above species occurs with us in the same habitat. The rigid-brittle, 

 convex pileus, the tapering-subradicating stem and the colors and 

 size distinguish our C. duracinus. It has somewhat the appearance 



