CuNNINGHAM.— The Ustilagineae, or “ Smuts,” of New Zealand. 409 
I am of the opinion, therefore, that U. Tritici Jens. and U. nuda Kell, 
“ ак и be reunited under one пате. Аз to the selection of this 
U. segetum cannot, of course, be used, nor can U. Hordei Bref., 
ie ‘this moled the recognized species U. Jensenii Rostr. and the one 
under discussion. U. Tritici Jens. was by Kellerman and Swingle described 
on page 262; U. nuda xem et Sw. on page 277: since the former has 
page priority, it is the one to be used. 
Clinton (1906) gives ihe citation of this species as U. Tritici (Pers.) 
Rostr., but the specific name used by Rostrup is taken from Uredo segetum 
var, Tritici Persoon, in Tent. Disp. Fung., p. 51, SS a publication which 
antedates the starting-point of modern nomenclatur 
he four species under discussion may then Е separated by the fol- 
lowing characte ters :— 
Probasidium producing conidia. 
Sori с nt. : 
Spores echinulate ap ЕУ is .. U. Avenae Jens. 
Spores smooth . . m rs “> Ls iios vis Magn. 
Sori pst s 7. Jensenii €— 
infecti i hypha conidia being absent р Tritici Jen 
Geriiiuation and infection (of U. Jensenii) are similar to the ава. 
two species. 
4. Ustilago Tritici Jensen. (Text-fig. 3, and Plate 42, fig. 1.) 
Jens.: Kell. et gi in Ann Rep. hie Agr. Exp. Stn., 
2nd 
Rep., p. 622, 
Ustilago segetum. var. T'ritici Jens., Om. Korns. oe p. 61, 1888. 'U. segetum 
a ordei forma nuda ou Agr. Soc., vol. 24, p. 4, 1889 
et Sw., Ann, Rep. Kansas Exp. Stn., 2nd | Rep. p. 277, 1890. U. Tritici 
(Pers.) Rostr., Overs. K. Danske Vid. Selsk. Forh. me p. 15, 1890. 
: j P. ] 
Sori in spikelets, destroying ovaries and glumes, forming olivaceous or 
almost black s i -masses, finally falling away and leaving the bare axis 
Spores Заан to shortly kp oe 5-8 x 4-5 mmm. ; epispore minutel 
but distinctly verruculose, pallid to dark olive, with a lighter-coloured 
zone on one side, 0-5-0-75 mmm. thick. 
Hosts :— 
Triticum vulgare Vill. In inflorescences. Herb. No. 407. Lincoln, 
anterbury, 30m., F. E. Ward! 5 March, 1921. 
iu vulgare L. In inflorescences. Herb. No. 46. Weraroa, 
€ 
The form on wheat is commonly known as “naked smut on wheat." 
се on barley as “ naked smut of barley." As has been pointed out (under 
U. Jensenii), the two forms differ only in that each is hes to its host, 
but as they are specum in morphological characters they must be con- 
sidered as the same specie 
The two species on ЕАУ may be separated on account of the following 
differences :— 
Sori compact ; spores smooth + i .. U. Jensenii. 
Sori pulverulent ; spores verruculose U. Tritici. 
Germination—In water a probasidium is ; produced which gives rise 
directly to an infection hypha; this may branch and form a mycelium, 
but does not at any time produce conidia. 
