ii. Net-threads often parallel in twos or threes 8. _C. intricata_ _b._ Sporangia small, less than .5 mm. 1. Nodes not expanded 3. _C. minutissima_ 2. Nodes well shown. i. Calyculus distinctly marked by radiant lines, nodes round 10. _C. tenella_ ii. Calyculus minute or none; nodes prominent 11. _C. microcarpa_ _B._ Sporangia more or less marked with purple or violet tints. _a._ Purple or violet throughout. 1. Net poorly developed 12. _C. violacea_ 2. Net well developed. i. Meshes regular and the nodes distinct 14. _C. elegans_ ii. Meshes and nodules irregular 13. _C. purpurea_ _b._ Purple tints confined chiefly to plasmodic granules on the calyculus and stipe. Net with nodes well expanded. i. Stipe short, not more than double the sporangium; net and calyculus both well developed 9. _C. piriformis_ ii. Stipe many times the sporangium, weak 15. _C. languescens_ iii. Stipe slender, sporangium copper-colored 16. _C. cuprea_ 1. CRIBRARIA ARGILLACEA _Pers._ PLATE XII., Figs. 12, 13; PLATE XVII., Fig. 1. 1791. _Stemonitis argillacea_ (Pers.) Gmel., _Syst. Nat._, II., 1469. 1796. _Cribraria argillacea_ Pers., _Obs. Myc._, I., p. 90. Sporangia dull ochraceous-olivaceous, globose, nearly 1 mm. in diameter, sessile or short stipitate, closely gregarious or crowded, the peridial walls at maturity smooth, shining, except above, long persistent, obscurely reticulate, with irregular thickenings which at the apex at length present the appearance of an irregular, coarsely meshed net without nodal thickenings; stipe very short, stout, erect, reddish brown, spore-mass ochraceous, spores by transmitted light pale, spinulose, 5-6 mu.