270 
Journal of Agricultural Research 
Vol. II, No. 4 
This description is incomplete, like many others, but the writer found 
this fungus so widely distributed on potato stems in the New England 
States that he feels justified in identifying it as Fusarium acuminatum * 
Blue sclerotial plectenchymata appear in pure cultures on stems of Meli- 
lotus, Zea, and a blue color occasionally develops in spots on plecten- 
chymatic bodies on potato tuber and wheat grains. 
II. HYPOMYCES (Fr.) Tul. 
12. Hypomyces ipomoeae (Hals.) Wollenw. (Pis. XIII, figs. A-G; XV, fig. A, i~ 6 ; 
and XVI, fig. H). 
Nectria ipomoeae , Hals., 1892, in N. J. Agr. Exp. Sta., 12th Ann. Rpt., 1891, p. 281-283, fig. 20-22. 
Creoncctria ipomoeae , Seaver, 19x0, in N. Amer. FI., v. 3, pt. 1, p. 22. 
Nectria coffeicola , Zixnm., 1901, mCcntbl. Bakt. [etc.], Abt. 2, Bd. 7, No. 3, p. 103-106, fig. 6. 
Hypomyces ipomoeae (Hals.) Wollenw., 1913, in Phytopathology, v. 3, no. 1, p. 34. 
Nectria saccharina. Berk, and Curt., 1869, in Jour. Linn. Soc. [London], Bot., v. 10, p. 378, no. 766, is 
probably a synonym of H. ipomoeae. 
Nectria Goroschankiniana, Wahrl., 1886, in Bot. Ztg., Jahrg. 44, No. 29, P. 503, pi. 3, fig. 17, 22, 25, is 
probably a synonym of H. ipomoeae. 
Diagnosis.—Perithecial stage: Perithecia scattered or gregarious, free on the surface 
of the host as well as embedded in mycelium or on a distinct plectenchymatic stroma, 
ovoid, subconical, subflask-shaped, averaging 225 to 375 by 175 to 300/1. Peridium 
strongly verrucose, owing to protuberance-like projections of cell groups, red to reddish 
brown, except the almost colorless conical beak. A few paraphyses line the inner 
wall of the throat from the ascus ball to the ostiolum. Asci up to over a hundred in 
each perithecium, intermixed with a few more celluled paraphyses. Ascospores, 8 in 
onerowor irregularly in two rows, 2-celled ovoid to ellipsoidal with wrinkled exospore, in 
mass brownish white; one septum, average size, 10 to 13 by 4.5 to 671, undermoist over¬ 
ripe condition slightly constricted at the septum. Conidial stage: Conidia scattered 
in sporodochia or pionnotes, of nearly cylindrical shape at the septal zone, slightly 
pointed and curved at the ends, base pedicellate without a distinct heel. Conidia, 
3 to 5 septate; 3-septate, 30 to 45 by 3.75 to 5/*; 5-septate, 45 to 70 by 4.25 to 5.5/1. Of 
the total number, 30 per cent may be 6-septate, 10 per cent may be 7-septate, with an 
average size up to 70 by 6/£. In young, moist, and hunger stages unicellular conidia 
occur, averaging 6 to 12 by 3 to 4.75/1. Color of conidia masses brownish white, occa¬ 
sionally impregnated with blue, a mycelium color, especially formed in the plecten¬ 
chymata. Conidiophores verticillately branched. Chlamydospores globose or ellip¬ 
soidal, terminal and intercalated, mostly unicellular and scattered, average diameter, 
7 to 10 fL. 
This diagnosis is derived from subcultures of a strain isolated by Dr. Donald Red¬ 
dick, of Cornell University Agricultural Experiment Station, from a badly rotted 
sweet potato sent him on April 30, 1907, by J. M. Van Hook, of the Ohio State Agricul¬ 
tural Experiment Station, Wooster, Ohio. 
Habitat.—Saprophyte on dead parts of plants. Probably a cosmopolitan and ubiq¬ 
uitous species. Found in North America on Solatium melongena. New Jersey; 
Ipomoea batatas , Clemson College, S. C.; and Vineland, N. J. (E. L. Harter and Ethel 
C. Field, 1912); Newark, Del. (J. J. Taubenhaus, 1912). Also in Asia on Coffea arabica t 
Melia azedarach , Theobroma cacao (fruit), Java (Zimmermann, sub Nectria coffeicola t 
1901); Glycine hispida Max., Phaseolus mungo t var. subtrilobata Province Higo, Japan 
(Yoshino, 1905).- In Africa on Cinchona (Zimmermann, sub Nectria coffeicola , 1904). 
In Europe on Orchydeae (roots; Wahrlich, sub Nectria Goroschankiniana , 1886). 
