62 REPORT OF THE BOTANIST OF THD 
die. The diseased stems are covered with the pycnidia of a 
fungus belonging to the genus Phoma, and it has been shown by 
inoculation experiments that this Phoma is the cause of the dis- 
ease. Although no experiments have been made it is probable 
that stem rot may be prevented by spraying with Bordeaux mix- 
ture as for anthracnose, 
THE ANTHRACNOSE. 
Early in the spring of 1897 the writer’s attention was called to 
an anthracnose which was doing serious damage to a bench of 
Antirrhinum majus in a greenhouse on Long Island. Upon in- 
quiry among florists it was learned that the anthracnose is a 
common disease, and wherever it occurs is more destructive than 
any other disease to which the Antirrhinum is subject, sometimes 
completely ruining an entire crop. 
It attacks the plants at any stage of their growth, both in the 
greenhouse and in the field. In the greenhouse it is more de- 
structive in the fall and spring than during the winter. In the 
field its ravages are most conspicuous in August and September. 
On the stems it produces numerous elliptical sunken spots from 
three to ten millimeters in length; and on the leaves circular dead 
spots having a diameter of from three to five millimeters, These 
spots are caused by an undescribed species of Colletotrichum for 
which we here propose the name Colletotrichum antirrhini2 
ON THE STEMS. 
Stems of all ages are attacked: The coalescence of several 
large spots may girdle the plant at the base; a single large spot 
*Colletotrichum antirrhini n. sp. Producing depressed spots on stems 
and leaves of Antirrhinum majus L.; stem spots elliptical, often confluent, 
3-10 mm, long; leaf spots orbicular, 3-5 mm. in diameter. Acervuli numer- 
ous and crowded, particularly on the stem spots; amphigenous on the 
leaf spots. Stroma well developed; on the leaves only slightly colored, 
but on the stems dark brown. Setz abundant, especially on the stems, 
dark brown, 50-100 / long, unbranched, mostly straight, tapering uni- 
formly to a sub-acute point. Conidia 16-21 x 4 vp straight or slightly 
curved, with rounded ends or frequently obtusely pointed at one side of 
one end, granular with a vacuole at the center when young. Basidia short. 
