262 Report OF THE BOTANICAL DEPARTMENT OF THE 
out examining all authentic herbarium material (if there is 
any) in connection with extended field observation and cultiva- 
tion of the above Phoma. 
OBSERVATIONS ON HERBARIUM MATERIAL*® RE- 
CEIVED FROM THE DELAWARE EXPERIMENT 
STATION, 1907. 
Squash vine material labeled Spherella had rather scattered 
perithecia, but of the same type and structure as those of the 
Mycospheerella-wilt fungus. The measurements were: peri- 
thecia 110-170 pw, asci 45-55 x 7-10 mw, and spores 10-13 x 4 p.- 
Squash stem material marked “ Ascochyta citrullina” was 
found to contain mostly perithecia of the Mycospheerella-wilt 
fungus, but also some of the typical Diplodina pycnidia, with 
spores hyaline, 9-15 » long, uniseptate, more or less cylindrical 
and with or without constrictions at the septa. The Myco- 
spherella perithecium, ascus and spore characters were the 
same as those of the Mycospherella-wilt fungus. 
The cucurbit leaf specimens labeled “Ascochyta citrullina 
(Ches.) Smith ” had pycnidia measuring 80-135 m3; the spores 
were elongate-ovoid, hyaline, continuous (about 3 per-ct. being 
doubtfully septate) and measuring 7-9 x 3 pw. It seems a fairly 
typical Phyllosticta. 
There were also a few good specimens marked “ Colleto- 
trichum,” on leaf petioles of squash. The fruiting regions on 
these petioles were typical of that genus. The sete were 
very conspicuous and the spores of the required type. 
A considerable quantity of material marked “Ascochyta on 
fruit of squash, collected by C. O. Smith, December 1903, 
Newark, Delaware,’ may be described as follows: Pyenidia 
irregularly scattered on discolored rind or in concentric rings 
on nearly unchanged and normally colored rind. Both types 
are covered by the unbent palisade-like layer of the squash- 
fruit epidermis; only the blackish ostiola bend and break 
39 Collected mostly by C. O. Smith, and lent by the Mycologists of the 
Delaware Exp. Sta. 
