252 THE MYXOMYCETES 



peridium opaque, didermatous, capillitium of simple or rarely branch- 

 ing filaments, variously beaded or marked with spiral bands, lightly 

 attached at either end, occasionally twisted together; spore-mass dull 

 brown, the spores ellipsoidal, mostly clustered in groups of from two 

 to six, colorless by transmitted light, smooth, 10-15 X 8-10 fx. Plas- 

 modium pink. 



A curious, flat plasmodiocarp, sometimes an inch or more in length. 

 It suggests Hemitrichia serpula prematurely dry. The Lister mono- 

 graph describes the spores as minutely warted on the outer side. The 

 spores of specimens received from Miss Lister have the appearance of 

 roughness under the dry lens, but under oil immersion it may be seen 

 that this is due to granules inside the spores, the walls being perfectly 

 smooth. 



Quebec, Alberta, Colorado, Washington; Europe, Australia. 



5. Dianema repens G. Lister & Cran 



Mycetozoa ed. 3. 255. 1925. 



Sporangia scattered, forming straight or curved, simple or branching 

 plasmodiocarps, 0.3 mm. wide or more, dull purplish brown, with a 

 wrinkled surface; sporangium wall membranous, almost colorless 

 above, pale purplish brown below, with a thin outer layer of dark 

 granular refuse matter; capillitium scanty, of brown threads 2-3 /x in 

 diameter, broader at the base, more slender above, branching and 

 anastomosing with wide membranous expansions; spores rosy pink in 

 mass, adhering in clusters of 4 to 12, globose or oval, minutely warted 

 on the exposed surface, 10-11 ju- Plasmodium rosy red. 



Rare. On lichens and hepatics on living trees. Great Britain. 



Family PERICHLENACE^E 



Sporangia simple, plasmodiocarpous or forming pseudo-aethalia; 

 capillitial threads slender, hollow, warted or spinulose or, in one genus, 

 smooth, attached at one end; wall usually double. Sometimes united 

 with the Arcyriaceae, from which family, as here defined, the members 

 of the present group are distinguished by the lack of a definite capil- 

 litial network, although the threads are sometimes more or less 

 branched and form a loose, tangled mass. 



KEY TO THE GENERA OF THE PERICH^ENACEiE 



a. Capillitium smooth; sporangia clustered, often massed to re- 

 semble an aethalium _ 1. Minakatella 



a. Capillitium warted or spiny; fructifications sporangiate or 



plasmodiocarpous, often closely appressed « 



