494 Transactions. 
Б. TiLLETIA Tulasne. 
Tul, Ann. Sci. Nat., ser. 3, vol. 7, p. 112, 1847. 
Sori in the form of a black spore-mass in various parts of the host, usually 
Distribution : World-wide. 
The four species that have been collected in New Zealand are all intro- 
duced. McAlpine (1906) records five species for Australia ; Clinton (1906) 
twenty-two for North America. 
The genus is separated from Ustilago mainly on account of the methods 
of germination and spore-formation. When these characters are unknown 
the species may be placed in either genus, but the large-spored forms are 
usually considered to belong to Tilletia. 
e-formation.—According to Fischer von Waldheim (1869), prior to 
spore-formation the sporogenous hyphae produce in succession numerous . 
lateral pyriform branches. These increase in diameter at their apices, 
finally appearing as globular bodies surrounded by a gelatinous membrane 
and attached to the main hyphae by slender stalks. Within the gelatinous 
walls the spores develop, and as they approach maturity the gelatinous 
membrane gradually becomes absorbed. Thus in this genus spore-formation 
is acrogenous, differing in this respect from Ustilago, in which the method 
of spore-formation is intercalary. 
e genus is confined to the Gramineae, although it has been recorded 
(doubtfully) as occurring on Sphagnum (Musci). 
Key то SPECIES. 
Spores smooth 2. T. levis. 
Spores reticulate. 
ў 1. T. decipiens. 
olcus ix 5s ; - 4. T. Holci. 
On Triticum жы E E is Bo. du те: 
1. Tilletia decipiens (Persoon) Koernicke. (Text-fig. 17.) Gramineae. 
Koern., in Wint. Die Pilze, vol. 1, p. 110, 1884. 
Uredo segetum var. decipiens Pers., Syn. Fung., р. 225, 1801. Tilletia sphaero 
с cocca F. v. Waldh., Bull. Soc. Wee Monk vei 1, p. 14, 1867. Veg 
Sori in ovaries, concealed within the glumes, black, compact, fetid. — - 
_ Spores globose or subglobose, 24-30 x 22-26 mmm.; epispore covered 
with a network of raised reticulations 2-5 mmm. high, surrounding polygon 
depressions 3-5 mmm. wide, pallid brown 3 
Host: Agrostis vulgaris With. In inflorescences. Herb. No. 176. 
hes ыш чуч Е. Вгисе / 1 Mar., 1920. Khandallah ir 
ngton), 200 m., E. Bruce Levy! 5 April, 1922. Tapanui (Otago), J. C. Neill! 
G. H. C. 2 Feb., 1924. г 2 UT 
exerts a stunting effect on the host; its presence may be noted on this 
whorl of fusiform septate conidia is prod idi d 
i 0 produced. The conidia may produce 
sickle-shaped secondary conidia whilst still attached to the probasidium. 
