408 Transactions. 
This species is abundant throughout New Zealand. It is separated 
from the preceding on account of the smooth epispores of the spores. The 
sori also differ somewhat in their being more compact. 
Germination, life-history, and control are the same as in U. Avenae, 
3. Ustilago Jensenii Rostrup. (Text-fig. 5, and Plate 42, fig. 2.) 
Rostr., Overs. K. Danske Vid. Selsk. Forh. 1890, p. 12, 1890. 
en Hordei var. tecta Jens., Charb. Cereales, p. 4, 1889. Ustilago Hordei Kell. 
et Sw., Ann. Rep. Kansas Agr. Exp. Stn., 2nd Rep., p. 268, 1890 
Sori in spikelets, forming а semi-compact ack? mass, bog covered 
by the бызаа basal parts of the glumes. 
Spores globose to shortly elliptical, 7-11 x 5-8 mmm. ; epispore smooth, 
olivaceous or sepia-brown, more lightly coloured on one side, 0-75-1 mmm. 
thick. 
Host: Hordeum vulgare L. In inflorescences. Herb. Nos. 298, 1253. 
Ruakura (Auckland), T m., A. H. Cockayne! 25 Jan., 1921. Blenheim 
ee ST J. Scott! 28 Feb., 1921. Winton (Otago), J. C. 
eill! 14 Feb., 
Distribution : a. ; North America ; Euro 
is is known as the “covered smut of barle on account of the 
manner in which the sori are covered by the basal portions of the glumes. 
It is common on this host throughout = Zealand. 
This species, together with U. Avenae, U. levis, and U. Tritici, were 
at one time included under the йш вресїев U. segetum Dittm. Jensen 
77 
into three races, as foll segetum var. Avenae; (2) U. segetum 
var. Tritici ; б) U. segetum var. Hordei. The variety Hordei he further 
divided in e two ms: U. segetum var. Hordei forma muda; 
U. segetum var. Hordei tonus tecta. 
Brefeld (1888) considered the forms on barley and on wheat to be 
distinct, for he found the probasidium did not produce conidia, but gave 
rise directly to an infection hypha. He found also that these races would 
not infect oats; consequently he considered them to be distinct from the 
form on oats, and included them under the name of U. Hordei Bref. In 
е 
Kellerman and Swingle (1890) raised to specifie rank the two forms 
on barley—nuda and tecta—naming them respectively U. nuda (Jens.) 
Kell. et Sw., and U. Hordei (Pers.) Kell. et Sw. Thus Brefeld's U. Hordei 
was split by them into three species — (1) U. Tritici (Jens.) Kell. et Sw.; 
(2) U. Hordei (Pers.) Kell. et Sw. ; (3) U. nuda (Jens.) Kell. et Sw 
ow, as the name Hordei was previously used by Brefeld, it cannot 
again be applied to a species; as U. Hordei of Kellerman and Swingle 
was named U. Jensenii by Rostrup the same year, this name should be 
used for this species. The matter is further complicated in that although 
the forms tecta and nuda are morphologically separable, and may therefore 
distinct eren, the form nuda (U. nuda Kell. et P is 
