36 Cinciunati Society of Natural History. 



Growing in dense patches on old wood and mosses. 

 Sporangia .4-.6 mm. in diameter, and reaching i mm. in 

 height, the elaters usually rather long, sometimes quite long 

 and branched. 



4. Oligonem.v brevifila, Peck. Sporangia subglobose, 

 irregular, sessile, crowded, forming clusters or effused patches ; 

 the wall thin, yellow, densely granulose and venulose. Mass 

 of capillitium and spores ochre-yellow ; elaters simple or 

 sometimes branched, often very short and fusiform, when 

 elongated having long tapering extremities, sometimes with 

 irregular swollen portions ; the surface minutely granulose 

 and rugulose, here and there a few spinules, occasionally with 

 indistinct spirals. Spores angularly or irregularl}- globose, 

 the surface reticulate, 11-12 mic. in diameter. 



(yrowing on old wood and mosses. Sporangia .4-. 5 mic. in 

 diameter, the elaters varying greatly in length, some not more 

 than 20 or 30 mic. long, others more than 100 mic. in length. 



B. Spores VI in ut civ jcartcd. 



5. Oligonem.v fulvum, Morgan n. sp. Sporangia rather 

 large, subglobose, sessile, closely crowded and more or less 

 irregular; the wall tawny yellow, very thin and fragile, 

 smooth, shining and iridescent. Mass of capillitium and 

 spores tawny yellow; elaters simple or sometimes branched, 

 mostly very short, 4 mic. in thickness, sometimes with 

 thicker swollen portions ; the surface marked with low smooth 

 spirals, in places faint and obsolete ; the extremities rounded 

 and obtuse, usually with a very minute apiculus, 1-3 mic. in 

 length. Spores globose, minutely warted, 10-13 mic. in 

 diameter. 



Growing on an old effused Sphaeria. Sporangia .6-. 8 mm. 

 in diameter, the elaters mostly 40-80 mic. in length, rarely 

 much longer and sometimes shorter; the longer elaters and 

 those that are branched often arise from confluence of the 

 shorter ones. 



