132 Cincinnati Society of Natural History. 



Growing on old wood, Sporangium about i mm. in diam- 

 eter. On account of the color of the .spores the genus Proto- 

 derma was created for this species by Rostafinski. It is num- 

 ber 2,316 of Schweinitz's N. A. Fungi. 



II. TUBULINA. Pers. Sporangia cylindric, or l^y mutual 

 pressure becoming prismatic, distinct or more or less connate 

 and aethalioid, the apex convex, seated upon a common hypo- 

 thallus; the wall a thin membrane, minutely granulose, firm 

 and quite persistent, gradually breaking away from the apex 

 downward. vSpores abundant, globose, umber or olivaceous. 



The sporangia u.sually stand erect in a single stratum, with 

 their walls separate or grown together: in the more compact 

 cethalioid forms, however, the sporangia, becoming elongated 

 and flexuous, pass upward and outward in various directions, 

 branching and anastomosing freely. See Plate III, Figs. 2, 3, 4. 



1. TuBULiNA CYLiNDRicA, Bull. Sporangia cylindric, more 

 or less elongated, closely crowded, distinct or connate, pale 

 umber to rusty-brown in color, seated on a well developed 

 hypothallus; the wall thin, firm, with minute veins and gran- 

 ules, semi-opaque, pale umber, often iridescent. Spores in 

 mass pale umber to ru.sty-brown, globose, most of the surface 

 reticulate, 6-8 mic. in diameter. 



Growing on old wood, mosses, etc. .'Ethalium circular or 

 irregular in shape, from one to several centimeters in extent, 

 the individual sporangia 2-4 mm. in height. Plasmodium at 

 first milky-white, soon changing to bright red, then to umber, 

 becoming paler when mature and dry. 



2. TuBULiNA Casparyi, Rost. Sporangia more or less 

 elongated, closely crowded and j^rismatic, connate, pale um- 

 ber to brown in color, seated on a conspicuous hypothallus ; 

 the wall thin, firm, minutely granulose. semi-opaque, pale 

 umber, iridescent when well matured; all or many of the 

 sporangia traversed by a central columella, from which a few 

 narrow bands of the membrane stretch to the adjacent walls. 

 Spores in the mass pale umber to brown, globose, the surface 

 reticulate, 7-9 mic. in diameter. 



Growing on old prostrate trunks. .Kthaliuni two or three 

 to several centimeters in extent, the individual sporangia 3-5 



