Apr.-Sept., 1914 
Illustrations 
VII 
Page 
Plate XIV. Gibberella Saubinetii (Mont.) Sacc. Figs. A-C,— Gibberella 
Saubinetii: Perithecia grown in pure culture. Fig. A.—On stem of Vida 
faba, with two ostiola surrounded by a collar of large peridial cells. Fig. 
B.—On wheat grains showing the ascus ball after one-half of the peridium 
had been lifted by a longitudinal section. Fig. C.—On Irish potato stem, 
without a distinct collar. Fig. D.— Gibberella Saubinetii: Two asci with a 
paraphysis. Fig. F.— Gibberella Saubinetii: Ascospores, 1, with slightly 
swollen cells, overripe; 2, normal shape; 3, dried condition. Figs. F-G.— 
Gibberella Saubinetii: Normal conidia grown on Irish potato stem. Fig. F.— 
12 days old. Fig. G .—6 days old, culture watered more; therefore the 
conidia are broader than in figure F. Fig. H.— Gibberella Saubinetii: Ab¬ 
normally multiseptate conidium about to germinate. These conidia are 
frequently to be found with swollen cells in young, and sometimes old 
cultures on the parenchyma of potato tubers. Fig. J.— Gibberella Saubinetii: 
Plectenchymatic parts of a stroma, formed by closely interwoven chains 
of swollen cells which have a thick membrane and brown to red contents 
with many vacuoles. Fig. K.— Gibberella Saubinetii: A number of conidia 
formed in young cultures on the moist surface of potato cylinders. Septa- 
tion (1, 3) and shape (2) rarely normal; 4, mother conidium broken into 
two halves (a, b), both of which have developed some small conidiophores 
from the cells tom asunder. 286 
Plate XV. Fig. A.— Hypomyces ipomoeae (Hals.) Wollenw.: Sweet-potato strain. 
1, 2, Grown in pure culture on cotton stem; 3, on maple stem; 4, on wheat 
straw; 5 and 6, on potato cylinder. Fig. B-C.— Hypomyces cancri (Rutg.), 
n. comb.: The hemp strain found with perithecia on a dead taproot of hemp 
at the soil level. Fig. B.—Grown on steamed corn kernels. Fig. C.—1, 
Perithecia from the original field material; 2, 3, Grown in pure cul¬ 
ture on cotton stem. Figs. D-G.— Gibberella Saubinetii (Mont.) Sacc.: 
The mycelium stage. Fig. D.—Grown on stem of Robinia, which was more 
or less reduced when single ascospores of these perithecia were transferred 
to fresh moist steamed stems of plants. Fig. F.—Grown on wheat straw. 
Figs. F and G.—Grown on cotton stem (on almost dry wheat straw the 
stroma could be reduced still more and completely disappeared in some of 
the later cultures on this medium).. 286 
Plate XVI. Fusarium spp. on sweet potato with and without known perfect 
stage, grown on sterilized vegetables. Figs. A-F.— Fusarium batatatis , 
n. sp. Fig. A.—Microconidia. Fig. B.—1, Intercalated and terminal 
chlamydospores; 2, In young stage; 3, Branch from sclerotial plectenchy- 
mata; therefore no true chlamydospores; 4, Chlamydospores formed from 
the content of conidial cells (conidio-chlamydospores); 5, Mature chlamydo¬ 
spores. Fig. C.—Two conidia anastomosing, one of them producing 
microconidia. Fig. D.—Normal conidia from sporodochia. Fig. F.— 
Conidiophore from a sporodochium. Figs. F-P.—Characteristic conidia 
of different species of Fusarium. Fig. F.— Fusarium hyperoxysporum , n. sp. 
Fig. G.— Fusarium acuminatum Fll. and Fv. Fig. H.— Hypomyces ipomoeae 
(Hals.) Wollenw. Fig. J.— Fusarium culmorum (W. G. Sm.) Sacc. Fig. 
K .—Fusarium radicicola, n. sp. Fig. L .—Fusarium incarnatum (Rob.) 
Sacc. Fig. M.— Fusarium caudatum, n. sp. Fig. N.— Fusarium orthoceras , 
var. iriseptatum, n. var. Fig. O .—Gibberella Saubinetii (Mont.) Sacc. 
Fig. P.— Fusarium caudatum , var. volutum, n. var, 
286 
