II4 MILDEWS, RUSTS AND SMUTS 
brown, 30—55 X 15—25 [JL, pedicel long, persistent, colour¬ 
less. 
On 'rcucrium scorodonia. Britain and Europe generally. 
THYMUS 
Puccinia caulinicola, Sclnicidcr. 
'/'cdculosporcs. Sori ininnle, rounded or elongated, wart- 
like, and for a long time covered by the epidermis, then 
|K)wdery and blackish-brown, mostly on the leafstalks 
and stem, rarely on the leaves ; spores elliptical, ends 
rounded, li|) not at all, or only slightly thickened, slightly 
constricted at the septum, smooth, pale brown, 25—35 
X 15—25 p, ])ediccl slender. 
Syn. Puccinia scJnicidcri, Schroet.; Plowr., IJred., p. 201. 
On Thymus set'pyllnm. Britain and Europe generally. 
'riie mycelium is ])erennial, and causes the stems to 
elongate, and grow more erect than in the healthy, normal 
condition. 
CONVOLVULUACEAE 
CONVOLVULUS 
Puccinia convolvuli. Cast.; Plowr., Ured., p. 146. 
Accidia. In groups on the under surface of the leaves 
and forming elongated swellings on the stem and leaf¬ 
stalks, on brownish or purplish spots, edge white, broad, 
much torn ; spores s\d)globose or angular, minutely warted, 
l>ale yellow, 18—30 y, diam. 
Lhedospoyes. Sori scattered or in rings, often crowded 
into each other, .soon naked, brown ; spores globose or 
snbglobose, rarely elliptical or ovoid, echinulate, pale 
brown, 25—35 X 18—2() p. 
'Tclculosporcs, Sori minute, often crowded together, 
covered for a long time by the grey epidermis, blackish 
brown, snmetimes arranged in circles ; spores oblong, 
oblong spindle-shaped or ellij)tical, tip blunt and slightly 
thickened, or more or less ]>ointed and much thickened, 
base rounded or slightly narrowed, slightly constricted at 
the sei)tum, smooth, chestnut-brown, 35—70 X 25—30 p, 
pedicel brownish, stout. Messoj)orcs mostly ovoid with 
the tip much thickened, brown, 25—35 X 20—26 p. 
Sy . llycdo sepinm, Spr. 
IJredo hctac, var. convolvuli, Pers. 
On Convolvulus sepiuni and C. arvensis. Britain, Europe 
gener.illy, Africa, Jai)an, and N. America. 
