166 



Mycologia 



of Eutypa (Plate ii, Fig. 5). Ascus clavate, 8-spored, apa- 

 raphysate. Ascospores allantoid, yellowish, unicellular. 



Rostronitschkia nervincola sp. nov. 



Nitschkia nervincola Rehm, in litt. 



Stromata formed in the secondary veins of the leaf, more 

 rarely in the midrib (Plate 11, Fig. 2), erumpent on the lower 

 side as very narrow, linear, black cushions, 0.3-0.5 X 2-10 mm. ; 

 the upper surface of the leaf immediately opposite these stromata 

 showing definite diseased spots (Plate 11, Fig. i) which, though 

 sometimes narrow and confined to the upper surface of the vein, 

 commonly spread over a wider area ; these spots in early stages 

 often distinctly rose-colored, later turning brown ; the ruptured 

 stromata developing first conidiophores and later perithecia ; 

 conidiophores pushing outward in compact masses forming 

 numerous, stout, capitate coremia or stalked sporodochia, 275- 

 600 /X in diam. at apex X 400 /x- in height, scattered irregularly 

 along the stroma or in one or two rather definite rows (Plate 11, 

 Fig- 3) j coremium dusty brown, the apical portion frequently 

 whitish and pruinose with conidia (Plate 11, Fig. 4), composed 

 of yellowish-brown, frequently septate, branching conidiophores, 

 which at the outer ends are abundantly and characteristically 

 marked with scars indicating the points of detachment of conidia ; 

 the first conidium borne terminally, the conidiophore then sending 

 out immediately below it a short lateral branch which bears a 

 second conidium ; the tip of the conidiophore as the result of the 

 continuation of this process assuming a peculiar crooked ap- 

 pearance ; conidia hyaline to yellowish, ovate, somewhat pointed 

 at one end, unicellular, 5-6 X i-S/^^; perithecia developed beneath 

 the conidial fructifications, and pushing outward so that the latter 

 fall away or remain attached to the outer surface of the peri- 

 thecial wall; perithecium globose, i mm. in diam. seated on the 

 stroma, and provided with a long, stout, 4-sulcate beak attaining 

 a length of slightly more than i mm., and terminated by the 

 ostiolum ; perithecia borne in a single row along the stroma, ad- 

 jacent perithecia frequently confluent; perithecial wall dull-black, 

 coriaceous, becoming carbonaceous on drying, not collapsing, 

 prominently wrinkled and roughened ; ascus clavate, 8-spored, 

 18-26 X 5-6 ya; ascospores allantoid, unicellular, at first hyaline, 

 later becoming distinctly yellowish, 6.7-8.4 X 1.7-2 /x, sub-biseriate 

 to irregularly crowded ; paraphyses absent. 



Parasitic in the leaves of Gesneria alhiflora in Porto Rico and 

 Jamaica. Not known to the writer from other localities nor on 

 other hosts. 



