The i\fyxomycctes of the Afiaini I'alley, Ohio. 21 



6. Arcvkia Cookki, Mass. vSporaiigium ovoid-cylindric, 

 the calyculus very small. vStipe long, erect, gray to mouse- 

 color, darker below, arising from a thin hypothallus. Capilli- 

 tium not much expanded after dehiscence, ovoid-cylindric, 

 erect, gray to mouse-color ; the superficial threads densely 

 and uniformly covered with minute warts, 3-5 mic. in thick- 

 ness ; the threads of the interior thinner, about 2 mic. and 

 smooth, or with very minute scattered warts. Spores globose, 

 even, 6-8 mic. in diameter. See Plate I, Fig. 16. 



Growing on old wood, mosses, etc. Capillitium 1-2 mm. 

 long, the stipe about the same length. It seems as common 

 as Arcvria cincrea, and has heretofore been included in it. 

 vSee Massee's Monograph, p. 154. 



7. Arcyria digitata, Schw. Sporangium cylindric, the 

 calyculus very small. Stipe long, ascending, brownish in 

 color, usually several fasiculate or to some extent connate, 

 the sporangia divergent at the apex. Capillitium not much 

 expanded after dehiscence, cylindric, pale cinereous, or pale 

 yellowish; the threads variable in thickness. 2-4 mic, those 

 at the surface densely and minutely warted, those of the 

 interior nearly smooth. Spores globose, even, 6-8 mic. in 

 diameter. 



Growing on old wood. Capillitium 2-4 mm. long, the stipe 

 about the same length. Arcyria bicolor, B. & C. 



III. HETEROTRICHIA, Ma.ssee. Sporangia regular, 

 oblong-ovoid, stipitate ; the wall a thin delicate membrane, 

 the upper part disappearing at maturit}', leaving the basal 

 portion as a small calyculus. Stipe filled with large thick- 

 walled vesicles, which are sub-angular from mutual pressure ; 

 these become smaller upward, and pass gradually into normal 

 spores. Capillitium issuing from the interior of the stipe, the 

 central and superficial threads dissimilar, forming a compli- 

 cated network, with numerous free extremities, the surface 

 minutely warted, or with annular ridges. Spores globose, 

 brownish. 



Distinguished from Arcyria by the numerous free extremi- 

 ties of the peripheral portion of the network. 



