CRIBRARIA.] HETERODERMACE.E. 139 



B. Nodes of the net expanded : 



A. Sporangia nut-brown 



a. Cup perforated at the margin, merging into the 



branching nodes. 5. C. macrocarpa 



b. Cup well-defined, nodes flattened, angular, branching, 



continued into the connecting threads. 



6. C. aurantiaca 



c. Cup replaced by strong ribs, nodes flattened. 



7. C. S'j)lendens 



d. Cup well-defined or absent, nodes thickened, pro- 



minent, numerous 



Nodes with many free rays, connected by more or 

 less parallel delicate threads. 8. C. intricata 



Nodes rounded in outline, with few or no free 

 rays, connected by three to five delicate threads. 



9. C. tenella 



B. Sporangia purple- or red-brown 



a. Stalk two to three times the height of the spo- 



rangium, plasmodic granules 2 ^ diam. 



10. C. pijriformis 



b. Stalk four to six times the height of the spo- 



rangium- 

 Cup one-third of the sporangium, nodes polygonal, 

 plasmodic granules 0'5 to 1 //, diam. 



11. C. languescens 



Cup minute or absent, nodes rounded, prominent, 

 plasmodic granules 1'5 to 2 /JL diam. 



12. C. microcarpa 

 c. Sporangia purple 



Cup one-third the sporangium, O7 mm. diam. 



13. C. pur pur ea 



Cup one-half the sporangium, 0*5 mm. diam. 



14. C. elegans 



D. Sporangia violet-blue-, sporangium O25 mm. diam. 



15. C. violacea 



1. C. argillacea Pers., in Homer, N. Mag. Bot., i., p. 91 (1794). 

 Plasm odium lead-coloured, in rotten wood. Total height O75 to 

 1-5 mm. Sporangia globose, crowded, stipitate, erect, or sessile, 

 0-5 to OS mm. diam., clay-coloured ; cup imperfectly defined ; 

 sporangium -wall subpersistent throughout, delicately membranous 

 above, stouter towards the base, reticulated with strongly or 

 faintly thickened bands, which are beset with dark plasmodic 

 granules 1 //, diam., and form a net with hardly expanded nodes 

 and subquadrangular meshes about 0*1 mm. wide. Stalk 



