210 British Uvedinee and Ustilaginee. 
BIoLocy.—The presence of the mycelium causes elongated fusi- 
form swellings on the petioles and midribs. It differs from P. sene- 
czonzs in the darker colour of the sori, which are almost black. 
VI. LEPTOPUCCINIA. Schrot. 
Having teleutospores only, which germinate upon the living plant as soon 
as they have arrived at maturity. The germ-tubes of the promycelial spores 
enter the host-plant either through the stomata or between the epidermal cells. 
Puccinia arenarie. (Schum.) 
Teleutospores—Sori compact, pulvinate, roundish, scattered, often 
circinate. Spores broadly fusiform or pyriform, summits 
pointed or rounded, often thickened, base rounded or attenu- 
ated, slightly constricted, smooth, pale yellowish brown, 30-50 
X Io-z0u,  Pedicels hyaline, colourless, as long as the 
spores. 
Synonyms. 
Puccinia arenavie (Schum.). Winter in Rabh., “ Krypt. Flor.,” 
vol. i. p. 169. 
Uredo arenarie. Schum., “ Enum. Plant. Sell.,” vol. ii. p. 232, 
Puccinia lychnidearum, Link.  Berk., “Eng. Flor.,” vol. v. 
p. 367, in part. Cooke, ‘‘Hdbk.,” p. 505, in part; “Micro. 
Fungi,” 4th edit., p. 2z0, in pant, 
Puccinia mehringia, Fckl. Cooke, “Micro. Fungi,” 4th 
edit., p. 210. 
Puccinia stellarie, Duby. Vize, Exs. 
Puccinia sagine, Fckl, Vize, Exs. 
Puctinia dianthi, D.C. Vize, Exs. 
Puccinia spergula,D. C. Cooke, “ Micro. Fungi,” 4th edit., 
p. 220. 
LExsiccati. 
Cooke, i. 8, 297; ii, 129, 130, 321, 432. Vize, “Micro. 
Fungi,” 35,125; “Micro, Fungi Brit.,” 32, 35. 
On Dianthus barbatus, Mehringia trinervia, Stellaria media, 
uliginosa, holostea, Sagina nodosa, procumbens, Spergula arvensis. 
May to November. 
BIOLOGY.—Cornu found that the teleutospores from MZ. ¢rinervia 
reproduced themselves in twenty-nine days on Alsine media and 
