286 



Mycologia 



Hypocreaceae 



Podostroma orbiculare sp. nov. 



Stromata stipitate or substipitate, orbicular, convex, yellowish 

 brown, white and woody within, 4-6 mm. in diam., 2-3.5 mm. 

 high, the surface minutely rugulose from the slightly protruding 

 ostiola; stem stout, short, not exceeding 2 mm. in diam. ; perithecia 

 entirely immersed in the stroma, 120-180 ^ in diam.; asci cylin- 

 drical, 50-60 x 4 /J,, becoming 16-spored at maturity; spores sub- 

 globose, hyaline, 2.5 x 3^; paraphyses present (fig. 11). 



This beautiful species is unique in having a woody stroma in- 

 stead of the fleshy or subfleshy stroma common to this and other 

 allied genera. It is placed in Podostroma rather than in Hypocrea, 

 since the stroma is stipitate. 



Material examined: 



On a decaying log. Porto Rican Fungi (Fink), No. 239, 

 Mayaguez, Dec. 17, 191 5 (type). 



Stilbocrea hypocreoides (Kalch. & Cooke) Seaver, Mycol. 2: 

 62. 1910. 



? Stilbocrea intermedia Ferd. & Wge., Bot. Tidsk. 29 : 12. 1908. 



This species is very closely related to S. intermedia, from which 

 it can, in fact, hardly be distinguished. Seaver (24) separates the 

 two forms on the basis of spore measurements, but the difference 

 'is so slight as to raise the question whether the two may not be 

 identical. 



Material examined: 



On bark and decaying wood. Herbarium Insular Experiment 

 Station (Stevenson), No. 2390, Rio Piedras, Nov. 29, 1914; Cor- 

 nell University Explorations of Porto Rico (Chardon), No. 1237, 

 Mayaguez, July 14, 1920. 



Dothichloe Atk. 



This genus comprises a few forms parasitic on grasses. It was 

 erected by Atkinson (4, 5) to include those species of Hypocrella 

 possessing a dothideaceous stroma like Dothichloe atramentosa 

 (B. & C.) Atk. 



