194 THE MYXOMYCETES OF PICTOU COUNTY. MOORE. 



in diameter, at the base, tapering upward. Calyculus with 

 radiating ribs, the margin toothed, the teeth merging into the 

 net above. The nodes are flattened, elongated and confluent near 

 the calyculus; in the upper parts, prominent, polygonal and 

 angular, the angles continued into the connecting threads. These 

 latter are delicate and free ends are common. The meshes ctf 

 the net are 3 5sided. Spores almost colorless by transmitted 

 light, slightly roughened. 5 6ft in diameter. 



This is with us a rather common species forming large 

 fructifications on decaying Psuga canadensis and other conifers. 

 The largest fructification which I have met with was 30 x 10 cm . 



24. Cribraria dictydioides Cke and Balf. Sporangia gre- 

 garious, spherical, small, .5 mm in diameter, cernuous. Stipe 

 l mm long, dark. Calyculus well developed marked with radiat- 

 ing lines of dark plasmodic granules, the margin denticulate. 

 Tihe nodes of the net are dark brown, connected by rather broad 

 hyaline threads radiating from the angles. Free ends numer- 

 ous. In the lower part of the net the nodes are more elongated 

 and branching. Spores almost colorless by transmitted light, 

 faintly warted, 7 8 p in diameter. 



On decaying conifers of various species. Kot rare.- 



Genus, Dictydium (Schrad.) Eost. 



Sporangia distinct. Peridium with narrow band-like thick- 

 enings on the inner surface, , radiating from the attachment of 

 the stipe to the top of tihe sporangium and connected by delicate 

 transverse thickenings. In the mature condition, the unthickened 

 portions disappear and the thickenings persist as a basket-like 

 structure with rectangular meshes, enclosing the spore mass. 



25. Dictydium cancellatum (Batsch.) Macbr. Sporangia 

 closely gregarious, depressed globose, cernuous. The older 

 sporangia become umbilicate at the top; .5 mm in diameter or 

 slightly larger. Stipe .6 2.4 mm in length, tapering upward, at 

 the top weak, twisted and white. Calyculus generally wanting. 



