XENODOCHUS 303 
Arthur records and names another species, X. minor, on 
Sanguisorba latifolia, from Alaska. 
Xenodochus carbonarius Schlecht. 
Yenodochus carbonarius Schlecht. in Linnea, i. 237, pl. 3, f. 3. Cooke, 
Handb. p. 489; Micr. Fung. p. 201, pl. 3, f. 29. Plowr. Ured. 
p. 227. Sace. Syll. vii. 751. 
Phragmidium carbonarium Wint. Pilze, p. 227. Fischer, Ured. 
Schweiz, p. 406, f. 284. Sydow, Monogr. iii. 157, f. 67. 
Aicidiospores. Czomata hypophyllous, on coloured spots, 
elongated, large, erumpent and pul- 
verulent on the nerves, petioles and 
stems, roundish and scattered on the 
leaves, bright orange-red or vermilion; 
spores roundish to oblong, verruculose, 
orange, 18—24 y, in short chains. 
Teleutospores. Sori amphigenous, 
often confluent with the c#omata, 
roundish, soon naked, thick, large, 
pulvinate, black; spores elongated- 
cylindrical, often curved, of 4—22 
cells, rounded at both ends, strongly 
constricted, smooth, dark-brown, 200— 
800 x 24-28 «4; each cell with two 
opposite germ-pores at the upper 
margin, except the uppermost which 
has one apical germ-pore; pedicels Fig. 229. X. carbonarius. 
very short, persistent. The whole - Bare rihy *<600 pe 
chain is surrounded by a distinct sub- 
hyaline membrane, which swells up considerably in lactic acid. 
On Sanguisorba officinalis. Not uncommon. June—Oc- 
tober. (Fig. 229.) ~ 
The teleutospore-cells of the Burnet Chain Rust mature from above 
downwards, the upper ones being darkest and the lower ones often 
colourless, There are no uredospores ; perhaps they are represented by 
secondary xcidiospores. The distinctions of this species from the other 
Phragmidiew are quite sufficient to justify its generic separation. 
Winter assigns to the ceeomata clavate paraphyses which I cannot find. 
DISTRIBUTION: Europe, Asia. 
