CuxxixGHAM.— Te Ustilagineae, or “ Smuts,” of New Zealand. 405 
резе рше н on this structure is produced a Mesue conidium 
idiun 
which in turn gives rise to à conidium ; in U. Tritici and U. striaeformis 
the probasidium gives rise directly to an infection hypha, conidia being 
absent. 
Key TO SPECIES oF USTILAGO. 
under 6 mmm.* long e xs ч .. U. comburens. 
Spores over 6 mmm. 
Spores smooth. 
Spores un 
Sori compact, covered with a membrane 3. U. Jensenii. 
Sori pulverulent, without a membrane % D 
Spores rough ; nular, verruculose, or verrucose. 
Spores somewhat coarsely verrucose 
Sori principally in the leaves 5. U. striaeformis. 
Sori principally in inflorescences 
mi-compact 7. U. bullata. 
verulent 6. U. bromivora. 
Spores minutely verruculose 
Spores over 10 uem 9. U. Readeri. 
S der 10 
Sori destroying сан: inflorescenc 4. U Tritici. 
ri semi-compact, only partially sc vins spikelets 1. U. Avenae. 
1. Ustilago Avenae Jensen. (Text-fig. 2, and Plate 41, fig. 2. 
Gramineae. 
eges ., Charb. Cereales, p. p 1889. 
U. perennans Ros Overs. K. Danske Vid. Selsk. ат a p. 15, 1890. 
Cintractia reed Ell. et Tr., Jo. Myc., or 6, p. 
Sori in spikelets, seldom in the leaves, ict Бр destroy- 
ing the floral parts, forming a pulverulent, olivaceous spore-mass, w ich 
eventually falls азыл, leaving only the bare axis of the inflorescence. 
s globose or subglobose, 5-9 mmm. diam.; epispore distinctly 
but finely P aer dote: раша olive, more lightly piai on one side, 
0-5-0-75 mmm. thick. 
Host: Arrhenatherum elatius (L.) гече. In inflorescences. Herb. 
No. 1247.  Plimmerton d sea-coast, E. Bruce Levy! 22 Dec., 
1990. Е. Н. Atkinson! 1 Dec., ; ао ссн 70 m., 
H. H. Allan! 15 Dec., 1921. боло; Dunrobin (Otago), J. C. Neill? 
The form on Arrhenatherum € was separated as a distinct species on 
account of the presence of pere ing mycelium in the perennial parts of 
the host; it is identical morphologically with the form on the oat, so that 
it cannot be consi ered as m n ар a biologic race. 
ermi —In water t res commence to 6 ES Y in from 
plasm of the spore penetrates, and after the quier m has attained 
a eee pci times that of the diameter of the Sus. several (3- E 
erminate and produce long and narrow infection yphae. A nutrient 
solution, according to Brefeld (1883), the conidia do not gars - phae, 
but produce mecondary - or or tertiary conidia by a process of budding 
* In this article the contraction “ mmm.’ "d for mieromillimetre 
t A few localities obtained between the Peda of reading the paper id publication 
have been inserted. 
