Cribmria. 61 



hypothallus; spores clear yellow, wall smooth, thin, 57 M. 

 diameter. 



Heterodictyon Bieniaszii, Racib., Hedw. 1889, p. 121. 



On rotten trunks. Poland. 



Stem 1'5 2'5 mm. high, sporangium 0'8 1 mm. diameter. 



Distinguished from C. mirabilis by the larger sporangium 

 and the greater number of ribs forming the lower part of the 

 network. 



Cribraria vulgar is, Schrad. 



Sporangia globose or slightly flattened below, stipitate, caly- 

 culus shallow, ribs very thin, parallel, crowded, margin regularly 

 dentate, the very thin threads of the network springing from 

 the teeth of the calyculus, and combining to form a dense net, 

 nodes distinct, but very small, rarely containing a few granules ; 

 stem slender, elongated, often rather flexuous, brown, with tinge 

 of purple, becoming thicker downwards and expanding into a 

 small hypothallus; spores very pale, globose, smooth, 5 7 n 

 diameter. 



Cribraria vulgaris, Schrad., Nov. PI. Gen., p. 6, t. i., f. 5 ; 

 Host,, Hon., p. 234, f. 26 ; Cke., Brit. Myx., fig. 26 ; Schroeter, 

 p. 105 ; Karst., Myc. Fenn. iv., p. 85 ; Sacc., Syll., no. 1410. 



Exsicc. Rab., Fung. Eur., 676 ; Fckl., Fung. Rhen., 2100. 



On decayed wood, especially pine. Germany ; Sweden ; Fin- 

 land. 



Gregarious, about 1'5 2 mm. high. Stem straight or curved 

 above. The features of the present species are the shallow 

 calyculus with thin, crowded, parallel, or more accurately, 

 radiating ribs, and the very small knots of the network. 



Cribraria elata, Mass. 



Sporangia globose, erect or sub-cernuous, stipitate, calyculus 

 small, funnel-shaped, radiating ribs well-developed, margin regu- 

 larly dentate, teeth elongated, acute, nodes of network numerous, 

 coloured, irregularly angular, crowded with granules, with 

 several prominent, tapering processes, connected by very slender 

 bands; stem with the calyculus dark reddish-brown, elongated, 



