O’Gara: Colletotrichum and Phoma 
39 
5 X 14-22 (x; setUi is inter condidia orientibus, paucis v. ntimerosis, 
fuligeneis v. atro-brunneis, subrectis v. curvulis v. flexuosis, saepe 
nodulosis, continuis v. obscure i-septatis, subacutis v. rotundatis, 
sursum angustioribus, basi 4.5-7 /x crassis, 38-205 /x. longis. 
Hab. in foliis, petiolis caulibusque vivis et languidis Trifolii 
pratensis, Utah, Amer. bor. 
A New Species of Colletotrichum on Potato 
A new species of Colletotrichum which confines its attacks 
mostly to the underground stems of the potato has been found in 
many potato fields in the Salt Lake Valley, Utah. Rarely is this 
new species found on the stems above the surface of the ground. 
Sometimes definite, dark-brown or black cankers are produced 
resembling to some extent those caused by Rhizoctonia, but 
more often the entire underground stem is involved. The my- 
celium invades the cortex beneath the epidermis and is at first 
hyaline and few-septate. Later, the mycelium becomes brown and 
many-celled, and forms sclerotia-like bodies just beneath the epi- 
dermis from which arise the setae and conidiophores. When 
the stems die, the epidermis readily comes off, exposing the dark- 
brown or black sclerotia-like bodies. The fungus has been cul- 
tivated in the laboratory for some time, and reproduces charac- 
teristically. It is related to Vermicularia. 
Colletotrichum solanicolum sp. nov. 
Mactilis plus minusve indeterminatis atro-brunneis vel nigris, 
plerumque in caulibus subterraneis, saepe totum partem caulii 
subteranii occupantibus ; acerzniUs numerosis, irregulariter spar- 
sis vel subgregariis, primo epidermide tectis, demum erumpen- 
tibus; mycelio in cellulis corticis primo hyalino et parce septato, 
deinde brunneo, pluriseptato, sclerotioideo, conidia setasque ge- 
rente ; setis fasciculatis, numerosis, atro-brunneis, ad apicem saepe 
pallidioribus, rectis, vel leniter curvulatis vel flexuosis, apice ob- 
tusis vel acutis, 1-3 septatis, 90-260 nx longis, cellula inferiore 
leniter inflatis, 6-7 /x crassis; conidiophoris inter setulis orientibus, 
subhyalinis, granulosis, brevibus, 2-8 /x longis ; conidiis continuiis, 
3-5“5 X 17-22 IX, rectis vel leniter curvulatis, apice rotundatis, ad 
basim leniter attenuatis, hyalinis, granulosis, saepe 1-3 guttulatis. 
maturescentibus vacuolum leniter refringens medio continentibus. 
Hab. in caulibus subterraneis vivis et emortuis Solani tuberosi, 
Salt Lake Valley, Utah, Amer. bor. 
