(333) 



12 a at apex; capitulum compact, subglobose, apical, about 

 50 u\ conidia globose, sharply echinulate, 12-15 p.. 



On dead stems of various berbaceous exogens, very com- 

 mon throughout Europe and North America. 



Persoon's description is not sufficient to fully identify his 

 species, but the material usually referred to it can not be dis- 

 tinguished from the better described and well figured P. 

 ■pycnosfora Fresen. The very abundance of the species 

 argues in favor of its being the one in Persoon's hands. 



2. Periconia lateralis El. & Ev. Jour. Myc. 2 : 104. 



1886. 



Widely effused over blackened areas ; conidiophores gre- 

 garious, erect, subulate, opake, septate, nearly straight, 250- 

 300 a high, 8-10// thick at base ; capitulum lateral, borne just 

 below the tip of the conidiophore, flattened ; conidia globose, 

 yellowish brown, echinulate, nucleate, 10-12 fi. 



On dead stems of grasses, Louisiana (Langlois). By a 

 strict construction this species would be excluded from Peri- 

 conia on account of its lateral capitulum. The entire group 

 is in need of further study with more abundant and fresher 

 material. Until this is possible it seems best not to increase 

 the number of generic names. 



a 



3. Periconia Commonsii sp. nov. 



Blackening the substratum over considerable areas : coni- 

 diophores densely gregarious, larger below and tapering up- 

 wards but not distinctly bulbous, obscurely 1-3-septate, 

 roughened bv adhering conidia, brown throughout, 150-300// 

 long, about 14 a wide at base, 7 //. at apex ; capitulum glob- 

 ular, terminal, 35-40 u; conidia globular, light brown, 

 minutely and sparingly echinulate, 6-7 ti. 



On decorticated area on dead limb of Morns, Delaware, 

 Aug., 1889, Commons no. 939 (in herb. Ellis). 



This specimen was labeled Periconia minutissima Corda? 

 In that species as shown by Corda Icones, 1 : fl. 5,f. 259, 

 the apex of the conidiophore is more or less branched, and 

 there are basidia differing in shape from the conidia. This 

 would exclude it from Pcrico?iia as here understood, but this 



