250 ILLINOIS ACADEMY OF SCIENCE 
ovate, 40-50x10-12 microns. Spores hyaline, 1-septate, some- 
what constricted, elongate-elliptical, cells slightly pointed at 
ends, 17-20 by 3-3.5 microns. 
On living leaves of Didymopanax mortoni, Dene. in Porto 
Rico; Afiasco, 35; 39; 297; 2962; 3591 (type) ; 3780; 5716; 
5748 ; 6829; 8140; Utuado, 4681. 
This species differs from Mycosphaerella araliae and M. 
panacis in that its spores are much larger, and from M. papy- 
rifera and M. longispora in its much smaller spore measure- 
ments. 
111.—MyCOSPHAERELLA DUBIA SP, nov. 
Spots amphigenous, round or somewhat irregular, becom- 
ing two or three centimeters in diameter, often confluent, dry, 
pale-brown, surrounded by a darker brown border which grad- 
ually shades off into the normal leaf tissue, many on a leaf. 
Perithecia epiphyllous, erumpent, scattered, minute, 45-60 
microns, ostiolate. Ostiole 10-12 microns in diameter. No 
paraphyses. Asci ovate, curved, 24-27x10 microns, Spores 
inordinate, hyaline, uniseptate, not constricted, straight, fu- 
soid, 10x3-3.5 microns. 
On living leaves of Solanum (?) sp. in Porto Rico: Maricao 
750 (type. ) 
This species differs from Mycosphaerella solani on Solanum 
dulcamara in having smaller perithecia and asci, and 
from M. asterinoides on members of the Solanaceae, M. lycu 
en Lycium vulgaris, and M. nicotianae and M. tabaca on Nico- 
tiana tabacum in having all its measurements smaller. 
IV.—MYCOSPHAERELLA GUTTIFERAE Sp. NOV. 
Spots epiphyllous, somewhat irregular, when young salmon- 
colored, when old covered by a cinereous, papery membrane, 
bounded by a raised border, composed of very narrow bands ot 
alternate light and dark brown. Spots reaching a diameter 
of one and one-half or two centimeters. Perithecia epiphyl- 
lous, numerous, black, erumpent, scattered over the entire spot, 
plainly visible 80-110 microns, with an ostiole 20-25 microns 
in diameter. Asci ovate or broadly clavate, 55-65x17 microns 
Spores slightly fusoid, uniseptate, inordinate, hyaline, the 
lower cell a little narrower, 24x4-5 microns. 
1. Mycologia, 7 (1915) 143. 
