The flfyxotnycetes of the Miami ] 'a I ley, Ohio. 151 



1. DiDKRMA RADiATUM, Linn. Sporangium depressed- 

 globose, the base flattened or umbilicate, stipitate or nearly 

 sessile; the wall smooth, whitish or pale brown, splitting 

 from the apex downward into a few reflexed irregular seg- 

 ments. Stipe short, thick, erect, tapering downward, stand- 

 ing on a thin membranaceous hypothallus ; the columella 

 large, convex, globose or obovoid, roughened. Capillitium of 

 slender dark-colored threads, radiating from the columella, 

 simple or branching outwardly. Spores globose, minutely 

 warted, dark violaceous, <S-io mic. in diameter. 



Growing on old bark and wood. Sporangium .8-1.2 mm. 

 in diameter, the stipe shorter than the diameter, sometimes 

 nearly obsolete. Apparently rare in this country. 



2. DiDERM.v FLORiFORME, Bull. Sporangium globose or 

 obovoid, stipitate, growing closely crowded together on a thin 

 brown membranaceous hypothallus ; the wall smooth, varying 

 in color from whitish or yellowish to bright brown, splitting 

 into irregular segments, which become reflexed and revolute. 

 Stipe long, erect, white or j-ellowish to brown ; the columella 

 elongated, obovoid to clavate, roughened, colored as the stipe. 

 Capillitium of dark-colored threads, radiating from the colu- 

 mella and sparingly branched. Spores globose, with minute 

 scattered w^arts, dark violaceous, 9-1 1 mic. in diameter. 

 Plate XII, Fig. 44. 



Growing on old wood of oak, hickory, etc., late in Autumn. 

 Sporangium .7-1.0 mm. in diameter before dehiscence, the 

 stipe usually longer than the sporangium. The color of stipe, 

 columella and sporangium varies from white through yellow- 

 ish to brown ; the spores are quite peculiar by reason of their 

 prominent scattered warts. I do not think Chondrioderma 

 Lyallii, Massee, can be maintained as a separate species. 



§2. Stromnidium. Sporangia growing closely crowded 

 together upon a thick highly-developed calcareous common 

 hypothallus, either seated upon it or partially imbedded in its 

 substance; the wall rupturing irregularly. 



3. DiDERMA SPUMARIOIDES, Fr. Sporangia rather small, 

 irregularly subglobose, sessile, seated close together on a 

 strongly-developed whitish or yellowish common hypothallus ; 

 the wall white, rugulose, covered by a dense farinaceous layer 



