MILDEWS, RUSTS AND SMUTS 
129 
thickened, mixed with numerous, yellowish-brown para- 
physes swollen at the tip ; mesospores mixed with the 
uredospores, ovoid or elongated pear-shaped, tip thickened 
and darker, densely echinulate, pale brown, 26—40 x 12— 
20 [JL. 
Teleiitospores. vSori scattered on the under surface of 
the Iqaf, or more or less in clusters, minute, powdery, 
blackish-brown ; spores elliptical, ovoid or oblong, com¬ 
posed of two almost globose cells, the lower one generally 
the smallest, tip not thickened, rather coarsely warted, 
especially the upper cell, 35^—^45 x 18—25 p, pedicel short, 
colourless, 
Syn. Piiccinia pnmi, Pers.; Plowr., Ured., p. 192. 
Puccinia prunorum, Link, 
Trichohasis rhamni, Cooke, 
On Prumis spinosa, P. domestica, Amygdalus communis, 
Persica vulgaris. Britain, Europe, Canary Islands, N, ancl 
S, America, vS, Africa, Australia, and New Zealand. 
The specimen named Trichohasis rhamni, by Cooke, 
and supposed to be parasitic on the leaves of Rhamnus 
catharticus, proves to be on the leaves of a Primus. 
Quite recently Biffen has proved by infection experiments 
that Aecidium punctatum, Pers,, parasitic on Anemone 
ranunculoides ( = A. coronaria), is the aecidial form of this 
species. The wide distribution of the teleutospore condition 
proves that the aecidial form is not necessary for its exis¬ 
tence, 
CRASSULACEAE 
RHODIOLA 
Puccinia rhodiolae, Berk, and Broome; Plowr,, Ured., 
p, 207, 
Teleiitospores. Sori on both sides of the leaves, and on 
the stem, most frequently on the under surface of the leaves, 
scattered or in crowded circular clusters on pale spots, for 
a long time covered by the epidermis, then powdery and 
dark brown ; spores broadly elliptical, ends rounded, tip 
slightly or not at all thickened, smooth, chestnut-brown, 
26—^40 X 20—25 p, pedicel, colourless, about as long as 
the spore, 
Syn, Puccinia hlytii, De Toni, 
On Rhodiola rosea i=Sedum rhodiola). Britain and 
