May 1, 1925 
Taxonomic Studies of Fusarium 
843 
Sec. 13. Elegans. No connection with an ascomycete is known. 
Sec. 14. Martiella. Hypomyces ipomoeae (Hals.) Wr., conidial stage F. 
jar ante urn Koord.; Hypomyces cancri Wr., conidial stage F. striatum- like; 
Hypomyces leptosphaeriae (Niessl) Wr., conidial stage F. sphaeriae Fuck. 
Sec. 15. Yentricosum. Hypomyces solani Rke. et Berth., conidial stage F. 
argillaceum (Fr.) Sacc. 
NOMENCLATURE IN RELATION TO 
SPECIES, VARIETIES, AND FORMS 
The plan recently considered and 
approved by the committees of the 
Phytopathological Society, the Society 
of Agronomy, and the Mycological 
section of the Botanical Society on 
June 6, 1924, in Washington, D. C., 
is followed in regard to questions of 
nomenclature and terminology. This 
plan provides for the use of the Latin 
trinomial composed of the genus, 
species, and variety. The species in¬ 
cludes groups of individuals which can 
be separated on the basis of morpho¬ 
logical character of such a nature as 
to be applicable and usable by mycol¬ 
ogists in general and which will be 
most serviceable for practical purposes. 
The variety is distinguished by morpho¬ 
logical characters, but less important 
than those used for specific segregation. 
An additional category termed forma 
is to be applied to subdivisions of the 
species or varieties characterized and 
distinguished primarily by physio¬ 
logical instead of morphological char¬ 
acters, though in some instances there 
may be present also some slight mor¬ 
phological, distinguishable differences. 
The forma is designated by an arabic 
numeral. 
LITERATURE CITED 
(1) Appel, O., and Wollenweber, H. W. 
1910. GRUNDLAGEN EINER MONOGRAPHIE DER 
GATTUNG FUSARIUM (LINK). Arb. K. Biol. 
Anst. Land-u. Forstw. 8: 1-207, illus. 
(2) -«-*— and Wollenweber, H. W. 
1910. DIE KULTUR ALS GRUNDLAGE ZUR BESSEREN 
UNTERSCHEIDUNG SYSTEMATISCH SCHWIERIGER 
hyphomyceten. Ber. Deut. Bot. Gesell. 
28: 435-448, illus. 
(3) Brown, W., and Horne, A. S. 
1924. STUDIES OF THE GENUS FUSARIUM. I. 
GENERAL account. Ann. Bot. 38: 379-383. 
(4) JOHANN, II. 
1923. INFLUENCE OF TEMPERATURE ON THE 
morphology of fusarium spores. (Abstract) 
Phytopathology 13: 51. 
(5) Sherbakoff, C. D. 
1915. fusaria of potatoes. N. Y. Cornell 
Agr. Exp. Sta. Mem. 6: 97-270, illus. 
( 0 ) — 
1922. fusaria of wheat and corn. (Abstract) 
Phytopathology 12:45. 
1925. use of agar blocks for photographing 
living spores. (Abstract) Phytopathology 
15:44. 
(8) Wollenweber, H. W. 
1913. STUDIES ON THE FUSARIUM PROBLEM. 
Phytopathology 3: 24-50, illus. 
(9) - 
1914. IDENTIFICATION OF SPECIES OF FUSARIUM 
OCCURRING ON THE SWEET POTATO, IPOMOEA 
batatas. Jour. Agr. Research 2: 251-286, 
illus. 
( 10 ) - 
1917. FUSARIA AUTOGRAPHICE DELINEATA. 
Ann. My col. 15: 1-56. 
( 11 )- 
1924. PYRENOMYCETEN-STUDIEN. AngeW. Bot. 
Ztschr. Erforsch. Nutzpflanz. 6: 300-313, 
illus. 
