181] PARASITIC FUNGI— STEVENS 15 



specimens the stroma is but little developed; the fungus then appears to 

 belong in the Sphaeriaceae. No genus in the Sphaeriaceae presents char- 

 acters showing affinity with it. The grouping of the stromata near the 

 veins is very characteristic, (Figures 17, 90). Most of them are immediately 

 on the veins, others are in the leaf tissue near the vein. They may be 

 located deep withm the tissue or may originate merely subepidermally. 



Uleodothis Theiss. and Syd. 

 Ann. Myc, 13:305, 1915. 



7. Uleodothis paspali Stevens n. sp. 



[Figures 20 to 23.] 



Stromata occupying the whole region between the upper and lower 

 epidermis, eventually erumpent, pseudo-parenchymatic. No clypeus on 

 either surface. Perithecia 1 to 30 in a group on a single stroma, epiphyllous. 

 Locules small, 62 to 108^ in diameter, round or somewhat flattened, ostio- 

 late, often somewhat rostrate. Asci numerous, 8-spored, linear, 60 to 72 

 X 7/Li, inordinate. Paraphyses filiform, equalling the asci in length. Spores 

 14 to 18 X 3.5m, fusiform, 1-septate, hyaline, guttulate. 



On Paspalum conjugalum. 



British Guiana: Coverden, August 8, 1922, 759. 



The stromata are very characteristic, separating this from Phyllachora 

 on the stroma character alone, consisting of compact masses of smoky 

 pseudoparenchyma filling the space between the two leaf surfaces. (Figure 

 20.) On the upper surfaces of these, but subepidermal, develop the locular 

 portions, eventually becoming erumpent and usually very numerous on 

 each stroma. The absence of a clypeus is also distinctive. While the 

 locules sometimes have a lining consisting of one or two rows of cells darker 

 than the remainder of the stroma such a lining is not always present and I 

 regard the fungus in the summation of its characters as Dothideaceous 

 rather than Sphaeriaceous. It does not agree with any of the three species, 

 all South American, given by Theissen and Sydow. 



AcHORELLA Theiss. and Syd. 

 Ann. Myc, 13:340, 1915. 



8. AcHORELLA GUiANENSis Stevens n. sp. 



[Figures 24 to 27, 91, 92.] 

 Stromata scattered over the leaf, numerous, amphigenous. Perithecia 

 spherical, in clusters usually from 3 to 8, black, slightly rough. Locules 

 spherical, 185 to 215^ in diameter with no diSerentiated perithecial wall. 

 Asci 8-spored, inordinate, 65 to 72 x 14 to 18/i/. Paraphyses numerous, 

 hyaline, filiform, gelatinous, crooked. Spores oblong, 22 to 29 x 5 to Tn, 

 septate, brown, constricted at the septum. 



