240 BOTANICAL GAZETTE [Marcu 
pl. 7, fig. 1 of GattLarp’s Le Genre Meliola. They are in a few 
forms somewhat tufted, and what are apparently transition forms 
to Arthrobotryum occur. The conidia are in most species truncate 
at one end, beaked at the other. The beaked end is apical and the 
truncated end is basal, although the reverse condition might be 
assumed were the spores not studied in situ (see fig. 10); in the 
3-septate forms the terminal cells are usually more pale than the 
central cells. The following key will serve to separate the Porto 
Rican species: 
Conidia often more than 3-septate 
Conidiophores not very toruloid at tip..................- .. .H. glabroides 
Conidiophores very toruloid at tip... 2.6.0... 6b. eee H. guareicolum 
Conidia not often more than 3-septate 
Cm ne TALE, CEGUSRICE is oo is on cas os 65 ek ves H. ocoteae 
Conidiophores not pale and translucent 
ORS SU hs os eek vate anaes . melastomacearum 
LORMIINNOE 890 Bi etic ede eat Oo TS H. panict 
Conidia differentiated strongly at two ends 
PR WOOTEN Fi ak in is oes eS H. parathesicolum 
Beak longer, usually 7 » or more 
Ora mpures GK, 7 ee ee aay cea H. helleri 
COR TIOTIOT OD UI A ae a ee H. philodendri 
Helminthosporium glabroides, sp. nov. (figs. 8-10).—Mycelium 
very fine, pale, almost hyaline, conidiophores solitary, but often 
close together, about 100-1407 uw, dark, sometimes pale at apex, 
often bent but not toruloid. Conidia 3-6-septate, 40-81 X6-7 H, 
truncate at base, tapering at apex. 
On Meliola glabroides Stev. on Piper aduncum, 9039, El Alto de la Bandera 
(type), 4390, Lares, 3582, Afiasco, 3647, Maricao, 4802, 3371, 7297, Arecibo, 
8471, Aibonito, 9603, Las Marias. The long conidia on this host are quite 
typical, with a truncate base and gradually tapering toward the apical end. 
Occasionally smaller, 3-septate spores are seen. These are shorter, propor- 
tionately thicker, and have a long apical cell. The variation from the long, 
many-celled spore to the shorter 3-celled one is sometimes striking. In one 
part of the microscope field one form may predominate, while in another part 
of this field the other spore form is dominant 
On Meliola comocladiae Stev. on Coimeclodie glabra, 7484, 7056, Mayaguez, 
760, Maricao. The conidiophores are darker than in the type and are some- 
times slightly toruloid. Occasionally there is a strong tendency for them to 
be in groups. 
