PAPERS ON BOTANY 167 
celled, 7x1-5, hyaline or very pale yellow. Paraphyses num- 
erous, fine, thread-like, crooked. 
On Erigeron spathulatus, Quebradillas, 6821 (type), Mau- 
nabo, 2453, Yauco, 3240. El Gigante, 8522, Maricao, 8935; 
on Erigeron pusillum, Maricao, 8805. 
Dimeriella olyrae sp. nov. 
Fungus superficial epiphyllous. Spot none, the fungus coat- 
ing the leaf surface evenly with black; mycelium yellow to 
dark brown, abundant, septate, crooked, about 3-4 » thick 
with a tendency to aggregate into a film at spots. Perithecia 
numerous, 51-68 » in diameter, black, slightly rough, each 
bearing 1-4, long, 234-300 », black setae. No ostiole. Asci 
ovate, 51-65x24 pw, 8 spored; spores inordinate, 17x7 p, 1-sep- 
tate, hyaline. No paraphyses. 
On Olyra latifolia, Preston’s Ranch, 6770 (type), Maricao, 
3639, 190, 3472, 8959, 8942, Mayaguez, 7486, 7587. 
This fungus is striking in the abundance of perithecia and 
the long, black setae on these. It clearly differs from Dimer- 
osporium oligotrichum Mont. & Sacc. (Not Sacc. & Berl.) 
which according to v. Hohnel belongs to the Capnodiaceae. 
Dimeriella cordiae (P. Henn.) Th. On Cordia sulcata, May- 
aguez, 975. 
Dimerium grammodes. On Meibomia barbata, Rio Piedras, 
7007. 
Perisporium Fries 
Perisporium truncatum sp. nov. 
Hypophyllous, forming smoky patches 1-2 cm, in diameter. 
Mycelium copious, superficial, brown, uniform, 7 », with septa 
about 50 » apart, branches often at right angles. Hyphopodia 
none. Mycelial setae erect, simple, straight, septate, 310 » 
long, 3.5 » thick at top, 8 » at base. Perithecia spherical, 
astomate, slightly rough, 109-202 u, carbonous; cells about 17 
pw in diameter, Asci ovate to cylindric, 125x34 u, thin walled. 
Spores 2-septate, cylindric, 68-92x10 p», hyaline when young, 
smoky or darker when old, rounded at one end truncated and 
with a ring around the other end. 
On Inga laurina, Maricao, 3657, 7023, Mayaguez, 7049 
(type), 7477, 7038, 7474, 9137, 974, 3905, 1076, El Alto de 
