Cribraria. 55 



passing into the Cribraria type of network towards the apex, 

 then, according to Rostafinski, it is Heterodictyon. There is, 

 in reality, every shade of transition between the two extremes, 

 and C. Bicniaszii closely connects the genus Cribraria in the 

 wider sense, with Dictydium. 



Distrib. Europe; United States; Ceylon: species 19. 



Sub-Gen. Heteroderma. Calyculus present. 



Network thickened, and forming nodes at the angles. 



Cribraria elegans, B. and C. 



Sporangia globose, stipitate, more or less cernuous, purple, 

 calyculus occupying nearly lower half of sporangial wall, with 

 numerous radiating ribs, and studded with organic purple 

 granules inside ; nodes of network numerous, large, angular or 

 irregularly stellate, containing purple granules, connected by 

 thin bands; stem elongated, expanding downwards, and pass- 

 ing into a small hypothallus, curved near the apex, purple ; 

 spores mass purple ; spores globose ; minutely warted, 5 7 /* 

 diameter. 



Cribraria elegans, B. and C., Grev., Vol. ii., p. 67 ; Sacc., Syll., 

 n. 1412 ; Host., Mon., App., p. 32. 



(Type in Herb. Berk., n. 10873.) 



On decayed wood. Lower Carolina. 



Scattered or gregarious, stem variable in length, 2 3 mm., 

 sometimes flexuous. There are no free ends in the network 

 of the sporangium. 



Cribraria piriformis, Schrad. 



Sporangia pyriform, stipitate, erect, purple-brown before de- 

 hisccnce, then yellowish-brown above, calyculus funnel-shaped, 

 occupying the lower third of sporangium, with radiating ribs, 

 margin eroded, nodes of network large, angular, coloured, with 

 prominent, acute processes, containing granules, united by very 

 slender threads ; stem about equal in length to sporangium, sub- 

 equal, purple-brown, expanding at the base into a hypothallus 

 of the same colour; spores very pale salmon-colour, globose, 

 smooth, 5 7 n diameter. 



