MILDEWS, RUSTS AND SMUTS 115 
APOCYNACEAE 
VINCA 
Puccinia vincae, Berk. ; Plowr., Ured., p. 161. 
Pycnidia. On the underside of the leaves, minute, 
brownish, often mixed with the uredospores. 
Uredospores. Sori scattered or in groups on the under 
surface of the leaf, irregular, powdery, surrounded by the 
ruptured epidermis, pale brown ; spores subglobose, ovate 
or pear-shaped, aculeate, pale brown, 25—35 p, or 20— 46 
X 16—24 
Teleutospores. Sori minute, scattered or crowded, circu¬ 
lar or irregular in form, powdery, surrounded by the torn 
epidermis, dusky brown, on the under surface of the leaf ; 
spores elliptical or ovate, rounded at both ends, tip not at 
all, or very slightly thickened, with a paler wart, minutely 
warted, the warts often arranged to form an irregular net¬ 
work, yellowish-brown, 35^—60 x 20—30 [jl, pedicel colour¬ 
less, rather long, deciduous. 
Syn. Uredo vincae, D.C. 
Puccinia herkeleyi, Pass. 
Trichohasis vincae, Cooke. 
On Vinca major. Britain and Europe. 
The pycnidia are sometimes scattered over the entire 
under surface of the leaves, and also occur on the stem. 
The leaves are stunted and fleshy in infected plants, in 
which the mycelium is perennial. Plowright describes 
an aecidial stage as follows. Sori pulvinate, not cup¬ 
shaped but discoidal, solid, 2—3 mm. in diameter, dark 
brown, with a greyish lustre. Spores globose, finely echinu- 
late, colourless, 10—12 p, diam. 
GENTIANACEAE 
GENTIANA 
Puccinia gentianae, Link.; Plowr., Ured., p. 147. 
Pycnidia. In scattered groups, honey-colour. 
Aecidia. In irregular groups on circular brownish spots 
on the under surface of the leaves and on the stem, cup¬ 
shaped, edge white, torn ; spores sobglobose or polygonal, 
minutely warted, orange, 15—25 p. 
Uredospores. Sori minute, scattered or arranged in 
rings, at first covered by the raised epidermis, circular, 
pale chestnut, on both sides of the leaves, but more es¬ 
pecially on the upper surface ; spores globose, subglobose 
