ASPERGILLUS FUMIGATUS, A. NIDULANS, A. TERREUS N. SP. 93 
peptone agar of the bacteriologists). They originate in coiled hyphae 
similar to the process described for A. fumigatoides or by DeBary^o 
for A. repens. The measurements and markings are a composite of 
those of A. fischeri, A. fumigatoides, and A. malignus Lindt. Clearly 
these forms are closely related and just as certainly may be regarded 
as members of the A. fumigatus group. How many of the entire 
series will stand critical examination is still in doubt. With this 
group as in previous papers (Thom, Thom and Currie),^^ it seems best 
to retain in the literature of the series the specific names found applied 
to such well-described forms as may represent in typical manner 
particular lines of variation. In general, however, it must be recog- 
nized that all the forms thus far reported grow at 37° C. or higher, 
that all of them as far as tests have been reported in the literature have 
proved pathogenic to some of the usual experimental animals, that 
the conidial apparatus in all of them corresponds closely to the de- 
scription by Fresenius. Even in ascospore production the common 
characters found overshadow the differences which are limited to 
contrasts in size and in details of spore markings. (See synopsis of 
the group, p. 97.) 
Characterization from Cultures {see also Table 2). — Colonies on 
Czapek s solution agar in some strains strictly velvety, in others with 
varying amounts of tufted aerial mycelium up to felted floccose forms, 
green to dark green, becoming almost black in age, spreading. Re- 
verse and substratum, in some strains uncolored, in others showing 
varying amounts of yellow, this occasionally becoming reddish in age. 
Conidiophores short, usually densely crowded, up to 300 ijl (occasional 
strains to 500 m) long by 2-8 ix in diameter, frequently more or less 
green colored, especially in the upper part, arising directly from sub- 
merged hyphae or as branches from aerial hyphae, septate or un- 
septate, gradually enlarged upward, with apical flask-shaped vesicles 
up to 20-30 }x in diameter, fertile only on the upper half, bearing 
sterigmata in one series, usually about 6-8 ijl (varying from 5-10 n) 
by 2-3 IJL, crowded, closely packed with axis parallel to axis of the 
stalk ; chains of conidia form solid columns up to 400 ix by 50 ix, but 
usually much shorter; conidia dark green in mass, globose, 2-3.5 M 
20 DeBary, A. Eurotium, Erysiphe, Cincinnobolus nebst Bemerkungen iiber 
die Geschlechtsorgane der Ascomyceten. Beitr. Morph. Phys. Pilze 3: i. 1870. 
2^ Thom, C. The Penicillium luteum-purpurogenum group. Mycologia 7: 
134-142. 1915; Thom, C, and Currie, J. N., loc. cit. 
