234 



lMCCINIA 



Teleutospores. Son oblong or linear, often confluent, 

 generally on the stems, rarely on the leaves (phylloclades), 

 blackish-brown; spores ellipsoid to clavate, thickened (up to 

 8/*) and rounded above, very gently constricted, rounded below, 

 smooth, brown, 35 52 x 17 — 2(i^; pedicels hyaline or brown- 

 ish, persistent, as long as or longer than the spore; a few 

 obovate mesospores intermixed. 



On Asparagus officinalis. iEcidia, not common, May; 



undo- and teleutospores, September — December, rather fre- 

 quent. (Fig. 180.) 



Fischer points out that the connection between the secidium and the 

 other spore-forms has not yet been demonstrated. This disease is often 

 very destructive to asparagus beds ; all diseased shoots should be gathered 

 and burnt. The best means of prevention is by the selection of resistant 

 varieties, and the avoidance of overcrowding. 



Distribution : Europe, Abyssinia, North America. 



103. Puccinia Liliacearum Duby. 



Puccinia LUiacearum Duby, Bot. Gall. ii. 891. Plowr. Ured. p. 107. 

 Sacc. Syll. vii. 668. Sydow, Monogr. i. 627. Fischer, Ured. 

 Schweiz, p. 76, 545, f. 57. 



Spermogones. Numerous, especially at the apex of the 

 affected leaves, yellowish, conical. 



[JHcidiospores. ^Ecidia few, scattered, minute, deeply im- 

 mersed, whitish, the narrow opening only pro- 

 jecting; spores minutely verruculose, orange, 

 about 15— -20 p.] 



Teleutospores. Sori amphigenous, embedded 

 in the dried yellowish parts of the leaf, hemi- 

 spherical, densely crowded, often confluent, long 

 covered by the ashy-grey epidermis which at 

 length opens by a cleft, then naked, pulverulent, 

 reddish-brown ; spores oblong-fusiform or cla- 

 vate, not thickened above and rounded or fre- 

 quently somewhat narrowed, not constricted, 

 indeed broadest at the septum, attenuated bel< >w, 

 Tde utospore smooth ' pallid-brown, 40-75 x 22-35 p. ; pedi- 

 (Lytham). eels hyaline, thick, rather long. 



