PERICH^ENA 255 



branched and minutely but distinctly spinulose; spore-mass yellow; 

 spores by transmitted light pale, minutely but distinctly verrucose, 

 7-9 11. The Plasmodium is said by Lister to be "pale brown, grey or 

 pink." 



Occurs on the inner bark of deciduous trees, especially of oak. Not 

 common. 



While this is doubtless Cornuvia circumscissa (Wallr.) of Rostafin- 

 ski's monograph, it is uncertain to what Wallroth referred. Lister 

 suggests Perichcena depressa. Rostafinski's other citations are equally 

 dubious. Currey's figures and description alone merit recognition. 



Ohio, Iowa, Tennessee, Ontario, West Indies, British Guiana, 

 Argentina; Europe, Ceylon, Java, Japan. 



3. Ophiotheca wrighth Berk. &* Curt. 



Jour. Linn. Soc. 10 : 349. 1869. 

 PI. XVII, Figs. 429, 430, 431, 432. 



1876. Cornuvia wrightii (Berk. & Curt.) Rost., Mon. App. 36. 



1911. Perichcena chrysosperma (Currey) Lister, Mycetozoa ed. 2. 248, in part. 



Plasmodiocarp bent or short-flexuous, often arcuate or completely 

 annular, sometimes globose, dark chestnut brown or black, opening 

 irregularly or sometimes circumscissile, especially in the sporangiate 

 fruitings; peridium thin, brittle, translucent, covered without by a 

 rather dense layer of brown or brownish black scales; capillitium of 

 long, sparingly branched threads furnished with projecting rough 

 spines remarkable for their length, up to twice the diameter of the 

 thread; spores yellow, minutely but distinctly warted, 9-10 fx. Plas- 

 modium dull lead-gray, becoming yellowish brown or pinkish before 

 fruiting. 



This is the common species everywhere on the inner side of the 

 bark of fallen trees, Ulmus, etc. It is readily distinguished at sight 

 by the peculiar annular, looped, and U-shaped plasmodiocarps, with 

 their dark umbrine or blackened surface. From the preceding it is 

 especially distinguished by the spinulose capillitium and slightly larger 

 spores. 



Not rare. New England, New York, Pennsylvania, Ohio, Wisconsin, 

 Iowa, Puerto Rico; Europe. 



3. Perichaena Fries 



Symb. Gast. 11. 1817. 



Sporangia typically flattened, sometimes small and roundish, more 

 often larger, polygonal by mutual interference or irregular; peridium 



