106 BOTANICAL GAZETTE [ AUGUST 
The perithecial form closely resembles that of G. céngulatum 
Atk. On first examination it was thought that, though of the 
same genus, a specific distinction existed in the more slender 
perithecia of the former and the smaller spore nieasurements. 
These characters vary, however, in different cultures, and the 
larger measurements of the perithecial stage of G. piperatum. 
E. & E. are common to the smaller perithecia and spores of the 
privet anthracnose. 
Ascospores sown in nutrient agar produced the conidia, and 
later on perithecia, which matured in thirteen days in the agar 
cultures, the colonies from ascospores having the same appeat- 
ance as those from conidia. These colonies differ from those of 
G. cingulatum Atk. in the more uniform growth and the compact 
interweaving of mycelium at the outer portion of the colony. 
A description of the perithecial stage is as follows : 
Perithecia cespitose, thinly membranaceous, dark brown, of 
a lighter color toward the ostiolum, at least in younger forms, 
pear-shaped, hairy, situated upon or partly immersed in a light- 
colored stroma of loosely interwoven threads. Asci aparaphy- 
sate, clavate, sessile ; sporidia eight, hyaline, single-celled, 
slightly curved, elliptical, subdistichous, 12-18 X 4-6. 
Gnomoniopsis cincta Stoneman (figs. 31, 110-114); Colleto- 
‘richum cinctum (Berk. & Curtiss); on orchid (Maxillaria piles 
Oncidium sp.). : a 
In connection with a study of the leaf spot of the conserva: Ss 
tory orchid by Mr. Paddock, a student in the laboratory, one nae 
the affected leaves, when placed in a moist chamber, developed - 
an anthracnose. The anthracnose had apparently no connection 
with the so-called “leaf spot” of the orchid, which‘is probably 
of non-parasitic origin2® Later other anthracnosed orchids : 
were found in cold house cultivation on species of the genera — 
Maxillaria and Oncidium, having a similar appearance 0? er 
to 
The disease has been found by Mr. Massee (Annals of Bot. 9: 42%: 1895) 
be due to sudden changes of temperature causing a precipitation of moisture 0% 
ves, 
lea 
