1918] STEVENS—MELIOLA PARASITES 229 
brown, usually 3-septate (sometimes less), often tapering toward 
one end, that is, ends not equally thick. Ends obtuse, median 
constriction greater than the others, wall thick, 2-3 u, surrounded 
by a distinct, thin, gelatinous coat. 
On Meliola compositarum var. portoricensis Stev.; on Eupatorium por- 
toricense, 6032 (type), 6557, 6056, 6003, 6861, 6031, 6866, Dos Bocas near 
Utuado, 5192, San Sebastian 
he presence of the 8- sooenl. fasci- 
cled, long, narrow asci and the absence 
of the typical Meliola mycelium dis- 
tinguish this Perisporium from Meliola. 
The peculiar lenticular perithecia, which 
stand on edge, are also characteristic. 
Associated with this species are conidio- 
phores and conidia, and it is entirely 
probable that it may be the ascigerous 
stage of one of the Meliolicolous species 
of Helminthosporium. 
ese two species 
of Perisporium are 
especially interesting, 
since, growing on  Fryg. 2 —Perisporium meliolae on Meliola compositarum 
Meliola, their perithecia var. portoricensis. no. 6032 (type); flattened perithecium; 
are likely to be taken views from side, edge, and from above; an ascus an 
for the Meliola perithe- single spore. 
resemble in character of spores. They are readily separable, however, from 
Meliola by the absence of the characteristic Meliola hyphopodia and by the 
presence of the fascicled, 8-spored asci which perhaps do not really occur in 
true Meliola 
DimErrIuM Piceum (B. and C.) Thiessen Bot. Centralbl. Beih. 
29:66. 1912.—Asterina picea B. and C.; Dimerium microsporium 
Speg.; D. meliolicolum Speg.; D. guineri R. Marie; Dimerosporium 
tropicale Speg.; D. clidemniae P. Henn.; D. hyptidicola P. Henn.; 
D. dendriticum A. and S. 
On Meliola glabra var. psychotriae Stev. on Psychotria sp., 5032, Quebra- 
dillas; on Palicourea (?) 1070, Mayaguez. -On Meliola bicornis Wint. on 
Meibomia supina, 4532, Cataho. On Meliola glabroides Stev. on Piper adun- 
cum, 4802, Maricao. On Meliola tortuosa Wint. on Piper umbellatum, 3379, 
Maricao. On Meliola ipomoeae E. Heller’s coll. no. 6285 appears to be the 
same, but the available material is scarce. On Meliola compositarum E. var. 
