CRIBRARIA 223 



which pass from node to node; spore-mass pale, ochraceous; spores 

 nearly smooth, colorless, 5-7 /x. 



This seems to be the most common Cribraria in the Mississippi 

 valley. It is generally distinguished by the scant calyculus and the 

 beautiful richness of its clear delicate net. The stellate nodules 

 especially above, emit filamental rays in all directions, but are, not- 

 w^ithstanding, united by single, unpaired threads only. The calycu- 

 lus is often entirely absent, and this has been supposed the typical 

 condition; but, on the contrary, there often may present itself a 

 cup as distinct as in C. aurantiaca. See, for this variation, Bot. Gaz. 

 XIX., p. 398. The rather large sporangia, .6-.7 mm., the nodes 

 joined by single threads, the remaining radiant threads, many or few, 

 but very short — these seem to be the most distinctly diagnostic char- 

 acters, and these are sufficiently constant to separate this species easily 

 from C. intricata on the one hand and C. tenella on the other. Mr. 

 Lister considers this merely a form of the next species. 



Abundant on rotten logs of every sort, especially oak; common on 

 the lower side of rotting pine planks in wooden walks along the 

 streets everywhere. N. A. F., 2095, seems to belong here. 



Pennsylvania, Ohio, North Carolina, Missouri, Illinois, Iowa, Ne- 

 braska. 



8. Cribraria intricata (Schrad.) Rost. 



1797. Cribraria intricata Schrad., Nov. Gen. PL, p. 7. 



Sporangia gregarious, globose, large, .7-1 mm, in diameter, nut- 

 brown or olivaceous, erect, stipitate; stipe long, slender, purplish 

 brown, flexuous ; calyculus variable, sometimes occupying one-third of 

 the sphere, when it is delicately costate, concolorous with the stipe, 

 and passes over to the net by a distinctly toothed or serrulate margin, 

 sometimes represented by irregular ribs or costa2 only; net well 

 differentiated, the threads delicate, transparent, yellow, connecting 

 large black nodules, running from one to the other in pairs or some- 

 times three together, free ends not numerous, the meshes few-sided, 

 often triangular; spores in mass, dull olivaceous, under the lens 

 pallid, nearly smooth, 6-7 fi. 



A very rare species, if indeed it occur in this country. At least 



