1918] STEVENS—MELIOLA PARASITES 239 
9334, Martin Pefia. On Meliola ambigua Pat. and Gaill. on Lantana, 6870, 
near Utuado. 
The species on M. glabroides shows some variation in that the coremia 
usually taper gradually from the base to tip and ‘are mounted upon a small 
tuft of radiating, fine, mycelial threads. 
What appears to be the same species, although sterile, is on Meliola psy- 
chotriae E. on Gonzalugunia spicata, 9134, Miradero, 7592, Mayaguez, and on 
Meliola melastomacearum Speg. on Miconia leavigata, 8085, near Utuado, and 
on Miconia racemosa, 7636, 7414, Mayaguez. On Meliola bicornis Wint. on 
Meibomia supina, 8975, 8793, Maricao. 
In addition to these the genus Arthrobotryum, under the name 
of Podosporium, has been noted as P. densum on Meliola sp. indet., 
as P. penicillioides on Meliola tonkinensis; while upon the following 
species of Meliola it has been described as a conidial stage: M. 
echinata, M. insignis, M. glabra, M. quercina. 
Helminthosporium Link 
Closely allied to Arthrobotryum is the genus Helminthosporium, 
which indeed, so far as it is parasitic upon Meliola, may be regarded 
as a simple form of Arthrobotryum; that is, in Arthrobotryum the 
conidiophores are fascicled in coremia, while in Helminthosporium 
the conidiophores are not so fascicled. In spore forms, in mycelial 
characters, and in all respects except the fasciculation of the conid- 
iophores, the two genera as they occur on Meliola are identical. 
They bear the same relation to each other as do the form genera 
Coremium and Penicillium, a relation which emphasizes strongly 
the artificiality of a taxonomic system which separates widely forms 
which are in reality very closely related. The assumed genetic 
connection of Helminthosporium with Meliola has been sufficiently 
discussed under Arthrobotryum. The facts stated in that connec- 
‘tion may be considered as applying equally to the forms now under 
discussion. 
The Meliolicolous species of Helminthosporium are typical rep- 
resentatives of the genus. The mycelium is very fine, sometimes 
scant and diffuse, more often dense and matted. The conidio- 
Phores are commonly solitary, usually although not always much 
darker than the mycelium, and always considerably thicker than 
the mycelium. Their origin from the mycelium is well shown in 
