ASPERGILLUS FUMIGATUS, A. NIDULANS, A. TERREUS N. SP. 89 
Fres. and A. nidulans Eid., both of which are abundant in soil cultures 
in America. Both of these species are green; A. terreus is never green. 
All three forms have small spores (2.5 ^ to 4 )u), short stalks and dense 
columnar or calyptriform masses of conidia. They thus have the form 
given for A. calyptratus by Oudemans.' A. fumigatus has one set of 
sterigmata in all heads. A. terreus shows one set of sterigmata occa- 
sionally in young heads but two sets in well-developed heads. A, 
rehmii has double sterigmata but is described as yellow. In A. 
calyptratus the conidial column although described as black is so 
colored in Oudemans's figures as to suggest A. terreus. More recently 
Werkenthin^ identified one strain of A. terreus as obtained from soil 
in Texas with Sterigmatocystis veneta of Massalongo.^ This form is 
described as having ''fasciculate fertile hyphae" and to be in color 
pale or dirty yellowish ("paUide vel sordide luteolis"). The Texas 
strain has superficial, interlacing, trailing ropes of hyphae from which 
short conidiophores arise. The same condition is produced in our 
original strain of A. terreus when grown upon peptone-beef-juice agar 
with cane sugar. The description of Massalongo does not appear to 
justify this identification. 
A considerable number of species have been described in color as 
avellaneus, cervinus, cinnamomeus, roseus, or by technical names 
falling within this related series of colors. These color-terms have 
been used so vaguely as frequently to mean only that the color so 
designated comes into the group, not that it has a definite tint or 
shade. Cultural study, moreover, shows that the same strain when 
grown under a series of differing cultural conditions may be succes- 
sively described by a whole series of these names. These variations 
have been studied in detail for certain series of forms with reference 
to the Code de Couleurs by Klincksieck and Valette^*^ and the recent 
work of Ridgway.^^ While exact duplication of culture-color in the 
charts is rare, the variations within closely related series tend to fall 
in the columns of Ridgway's plates; that is, in tints and shades of 
^ Oudemans, C. A. J. A., and Koning, C. J. Prodrome d'une flore mycologique 
obtenue par la culture sur gelatine preparee de la terre humeuse du Spanderswoud 
pres de Bussum. Extr. Arch. Neerl. Sci. 267-298, pis. 1-41. 1902. 
^ Werkenthin, F. C. Fungous flora of Texas soils. Phytopathology 6: 241- 
253. 191 6. Ref. to pages 247-248-249. 
^ Massalongo, C. Novita della flora micologica Veronese. Bull. Soc. Bot. 
Ital. 259. 1900. 
10 Klincksieck, P., et Valette, Th. Code de Couleurs. Paris . 1908. 
Ridgway, loc. cit. 
