18G THE MYXOMYCETES OF I'lCTOL^ COUNTV. — MOORE. 



10. Leocarpus fragilis (Dickson) Rost. — Sporangia obovoid, 

 1.8™™ long, .i)™™ broad, shining, brown in color. Poridinm 

 double, stipe vcrv weak, straw colored, iidt <u]ti)iirtiiig the spor- 

 angia which generally lie (ui the substratum anchored by tdie 

 weak, thread-like stipes. Capillitium forming a net the terminal 

 branches united with ihe inner ])eridinm. The net consists 

 jiartly <it' hyaline tul)ules scunewhat ex])an(led at the nodes and 

 partly of broader, more expanded tubules packed with dark 

 colored lime granules. Spores violet colored by transmitted 

 light, spinulose, 12 — 14/x in diameter. 



On decaying Abies halsamea, moss, leaves, etc. 



In all (if my collections the sjiorangia are nnmero\is and 

 crowded. 



Family, DIDYMIE^. 



Characterized among the PhysaraceaB by the calcareous 

 deposits being confined to the peridium. The family is repre- 

 sented in my collections l)y but two species, the first of which 

 appears to be one of our commonest Myxomycetes. 



Genus, Didymium (Sclirad) Fr. 



Fruit bodies se])arale sporangia or plasmodiocarps. Peri- 

 dinm simple or double, the outer wall covered more or less 

 conij)letely with lime crystals which generally lie loosely upon 

 it or more rarely are united into a firm crust. Colnmella want- 

 ing or ])resent and hemispherical or disc shaped, (yapillitium 

 filamentous, free from lime. 



11. Didi/iiiiinii melanospernium (Pers.) Macbr. — Spor- 

 angia gregarious covering areas of several squ,arc centimetres 

 in extent; light ashen grey or almost white in color; depressed 

 hemispherical deeply uml)ilicate l)elow, stipulate, a,bout .75""" 

 in diameter. Columella hemispherical. Stipe black, short, 

 stout below tapering upward, one-sixth of a millimetre or less 

 in height, the sporangia in fact sometimes apparently sessile. 

 Peridium thickly frosted with stellate lime crystals. Ilypothal- 



