2 2 Chicinnati Society of Natural History. 



I. Heterotrichia Gabriell.K, Massee. Sporangium 

 oblong-ovoid, stipitate ; the calyculus small, thin, smooth. 

 Stipe very short, erect, yellowish-brown in color. Capillitium 

 much elongated after dehiscence, cylindric-ovoid, sub-erect; 

 the threads of the central portion about 1.5 mic. thick, with 

 slightly elevated ridges partly encircling the tube, nearly 

 colorless ; threads of the peripheral portion bright yellow, 5-6 

 mic. thick, with numerous short acute free branches, the sur- 

 face densely and minutely warted. Spores in mass, yellowish- 

 brown, globose, even, 7-8 mic in diameter. See Plate I, 

 Fig. 18. 



Growing on wood; S. Carolina, H. IV. Ravcm/. The 

 sporangia densely- crowded, becoming scattered toward the 

 margin of the cluster. Massee's Monograph of the Myxo- 

 gasters. 



Order V. TRICHIACE^. 



Sporangium regular and stipitate or ses.sile, rarel}- 

 plasmodiocarp ; tlie wall a thin membrane, usually 

 granular or venulose on the inner surface, colored as 

 the spores and capillitium, irregular!}- dehiscent. 

 Capillitium of slender tubules, simple or branched, 

 scarcely forming an evident network ; the surface of 

 the threads furnished with continuous ridges, which 

 wind around the tube in a spiral manner. Spores 

 globose, red, brown, 3'ellow, olivaceous. 



This order is readily recognized by the spiral ridges which 

 wind around the tubules of the capillitium. 



Tahmc of Genera oi" Trichi.vce.i-:. 



I. Hi:miarcvria. Capillitium of long slender tubules, 

 arising from the base of the sporangium, or issuing from the 

 interior of the stipe; the s])iral ridges parallel and con- 

 picuous. 



