DOTHIDIACEOUS AND OTHER PORTO RICAN FUNGI 



F. L. Stevens 



(WITH PLATES XIII, XIV AND THREE FIGURES) 



The following fungi were collected by the author in Porto Rico, 

 and specimens are deposited in the herbarium of the University 

 of Illinois, and of the New York Botanical Garden. The limitations 

 accepted for the Dothidiaceous genera are those of Theissen 

 and Sydow, 1 which seem to be well founded and wholly tenable. 



Dothideales 



DOTHIDEACEAE 



Auerswaldia Cecropiae P. Henn. (figs. 4, 5). 



On Cecropia peltata: El Alto de le Bandera, 9043; Mayaguez, 393 J 5 

 Maricao, 8965; Rio Arecibo, 7798; Florida Adentro, 7756, 2475; Jayuya, 

 361; Afiasco, 3581; Utuado, 6064. 



This fungus, as the number of collections shows, is abundant in Porto 

 Rico. From descriptions it seems to be the one just named. It is very 

 variable in habit, especially with age, and there is some doubt as to its generic 

 position. In young specimens there is no stroma, and the fungus appears 

 Sphaeriaceous. In older specimens the stroma is well developed, and the 

 fungus is clearly Dothidiaceous. No colored spores were seen, and the fungus 

 to all appearances is really a Phyllachorella. Type material of A. Cecropiae 

 P. Henn. and Physalospora Cecropiae Rehm are needed before a satisfactory 

 decision can be made. 



Uleodothis 



,d, *-* mm 



Pteridis, sp. nov. (figs. 6, 7). — Spots tan-colored, 

 across. Stromata black, rugose with perithecia, 

 1-2 mm. across, conspicuous above, less so below, slightly raised 

 above the leaf surface, orginating sub-epidermally but eventually 

 occupying the whole mesophyll, the upper surface rough and 

 raised, without clypeus, and remaining covered by fragments of 

 the epidermis. Hyphae of the stroma of general parallel arrange- 

 ment. Loculi many, about 100 /x in diameter, globular. Asci 



1 Ann. Mycol. 13:149. 1915 

 Botanical Gazette, vol. 69] 



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