The Myxomycctcs of the Afiaini Valley, Ohio. 15 



Growing 011 the inside of the bark of lUni. vSporangia 

 .5-. 6 mm. in diameter, quite regular in shape, with a slightly 

 flattened base. M}' s})ecimens are from Prof. McHride, of Iowa. 



4. Pkrich.Hna makginata, Schw. Sporangia depressed, 

 polygonal, approximate and sometimes confluent, the surface 

 cinereous-pulverulent, seated on a silvery hypothallus ; the 

 wall firm, thick, the outer surface yellow-brown, covered with 

 minute whitish scales, the inner surface yellow, deeply reticu- 

 lately impressed by the spores which rest against it, dehiscent 

 in a circumscissile manner. Capillitium consisting of a few 

 simple or somewhat branched threads or well-nigh obsolete. 

 Spores subglobose, yellow, 12-14 "lic- in diameter. 



Growing on the outer surface of the bark of Acer, Fagus, 

 etc. Sporangia .4-. 6 mm. in width. This is plainly Pcrichcrna 

 cano-flavesceiis, Raunkier. I do not find an}' threads of a 

 capillitivim in my specimens. 



II. OPHIOTHECA, Currey. Plasmodiocarp terete and 

 more or less elongated, bent and flexuous, sometimes annular 

 or reticulate, the surface not polished or shining : the wall a 

 thin membrane, with a thin outer layer of minute scales and 

 granules, irregularly dehiscent. Capillitium of very slender 

 loosely-branched threads, with the surface minutely warted 

 and spinulose. Spores globose, oval or somewhat irregular, 

 yellow. 



Distinguished from Perichaena by the terete plasmodiocarp 

 and by the more spinulose capillitium. Coninvia of Rosta- 

 finski. 



I. Ophiotheca chrysosperma, Currey. Plasmodiocarp 

 globose or oblong to elongated, and bent or flexuous, some- 

 times annular or branched and-reticulate, dull brown in color; 

 the wall a thin yellowish membrane, with a thin yellow-Urown 

 outer layer, irregularly dehiscent. Capillitium of slender 

 loosely-branched threads, 2-3 mic. in thickness, the surface 

 minutely spinulose. Spores subglobose, yellow, 8-9 mic. in 

 diameter. 



Growing on the inner surface of old bark of Quercus, etc. 

 Plasmodiocarp .4-. 5 mm. in thickness, variable in length. 

 Cor7iuvia circtimscissa of Rostafinski's monograph. 



