The I\Iyxoviycctcs of the Miami Valley, Ohio. 13 



THK MYXOMYCETES OF THE MIAMI VALLEY, 



OHIO. 



By a. p. Morgan. 



Second Paper. 

 (Read May 2, 1893.) 



Order III. PERICH/ENACE^. 



Sporangia sessile or plasmodiocarp ; the wall a 

 thin membrane, with a more or less thickened outer 

 layer of minute brownish scales and granules. 

 Capillitium of long and very slender tubules, pro- 

 ceeding from numerous points of the sporangial 

 wall, loosely branched, forming no evident network, 

 the surface minutely warted or spinulose. Spores 

 globose, oval, or somewhat irregular, yellow. 



The order is distinguished by the sessile sporangia, with 

 thick brown walls, and the very slender threads of the capilli- 

 tium, with irregular and indefinite markings. 



Table of Gener.\ of Perich.*;nace.'E. 



1. PERiCH.^iNA. Sporangia more or less depressed, round- 

 ish or more commonly polygonal and irregular, dehiscent in a 

 circumscissile manner. 



2. Ophiothpx.v. Plasmodiocarp terete and more or less 

 elongated, bent and flexuous, sometimes annular or reticulate, 

 irregularly dehiscent. 



I. PERICH^ENA, Fr. Sporangia more or less depressed, 

 roundish or more commonly polygonal and irregular, the 

 edges approximate and sometimes confluent ; the wall a thin 



