760 THE AGARICACEAE OF MICHIGAN 



806. Collybia hygrophoroides Pk. 



N. Y. State Mus. Rep. 32, 1879. 

 Illustration: Plate CLXIV of this Report. 



PILEUS 24 cm. broad, obtusely conical at first and reddish- 

 brick color, then campanulate to expanded and almost plane, with 

 or without Umbo, rufous-tan (moist), dull-tan or isabelline (dry), 

 hygrophanous, glabrous, even, margin straight at first. FLESH 

 thin, whitish. GILLS arcuate-uncinate or deeply emarginate, al- 

 most free at times, close, rather broad, ventricose, dingy white at 

 first, then tinged flesh color, edge becoming eroded. STEM 5-12 

 cm. long, 2-5 mm. thick, tough, often long and twisted, longitudi- 

 nally striate to sulcate, lower third rooting and densely white-to- 

 mentose, upper part pallid to rufescent and pruinose, stuffed then 

 hollow, curved or straight. SPORES oblong, 5-0.5x3-3.5 micr., 

 smooth, white in mass. CYSTIDIA rather abundant on sides of 

 gills, slender, acuminate above, 50-60 x 4-5 micr. 



Solitary to subcaespitose or scattered. On the ground in low, 

 moist, maple and oak Avoods. Ann Arbor. May-July. Rare and 

 local ; rather common in a single locality. 



This is apparently a Mycena as shown by the straight margin of 

 the young pileus. It somewhat resembles Cooke's figure of M. 

 excisa (Plate 148), (= M. berkeleyi Mass.) which is certainly not 

 the M. excisa figured by Fries (Icones). That species, however, 

 grows on trunks of pine, and the color is different from ours accord- 

 ing to Fries' description. The young, unopened pileus resembles 

 that of Eygrophorus conicus in color and shape, as pointed out by 

 Peck. It seems to have no direct relationship to either Mycena 

 or Collybia. The lower half or third is usually immersed in the 

 soil which adheres to the tomentum when pulled up; this portion 

 may be attenuated or scarcely so as shown in our plate. The older 

 plants have rufescent gills and stem, but the spore-print is white. 

 Our specimens were seen and identified by Peck, who says it is 

 a very rare species. 



