.-,;, THE AGARICACEAE OF MICHIGAN 



573. Chamaeota sphaerospora (Pk.) 



Torr. Bot Club, Bull. 33, p. 216, 1906. (As Anuularia.) 

 [llustrations : Plates VI, CII of this Report. 



PILEUS 3-6 cm. broad, conic or subcainpanulate, becoming ex- 

 pauded, umbonate, siiky-iibrillose, yellow, fading to whitish in 

 part, umbo brownish. FLESH thin. GILLS free, close, thin, whit- 

 ish o!- cream-colored when young, flesh-color when mature, nioder- 



ely broad, edge white-fimbriate; trama of parallel hyphae. STEM 



- cm. long, Is mm. thick, equal or tapering upward, solid, fibrous, 

 substriate, whitish. ANNULUS white, median or below the mid- 

 dle. SPORES globose or subglobose, 5-6 inicr. diam., smooth, non- 

 apiculate, dull flesh-color. BASIDIA 1-spored, at maturity pro- 

 jecting beyond the younger kymenium, about 25x8-9 micr. CYS- 

 TIDIA none, except on edge, which is densely covered by slender 

 stalked long cells, enlarged at apex. 



Subcaespitose. On rotten wood of elm trunk. Detroit. Col- 

 lected by Dr. Fischer. August. Rare. Cotype in the University 

 of Michigan herbarium. 



Described by Dr. Peck from material collected near Detroit by 

 ' ». E. Fischer. It has been suggested that it is identical with C. 



'-.Hi Pr., illustrated as follows: 



k'alchbrenner and Schulzer, Icones, Hvinen Hung., PI. 10, 



Fig. 1. 

 Gillet, Champignons de France, No. 30. 

 Engler and Prantl. I, 1** Fig. 121. B. p. 258. 



In some respects it certainly has similar characters, but Gillet, 



who gives a lull description, says the spores are "large" and his 



figures confirm this if we compare them with those in which he 



shows small spores of other species. Unfortunately neither 



Gillet nor any one else appears to have recorded the 



spore-measurements of C. jenzlii. Furthermore, the latter species 



3 described as smaller, the annulus and stem yellow, or yellowish, 



the former evanescent. Gillet says the stem of C. jenzlii is at first 



solid then hollow. Further information concerning the variation 



"' ' P lan1 is necessary before it can be reduced to synonymy. It 



8eems "' be ;l yry y rare plant and is onlv recorded from the one 

 locality. 



