1 34 



PUCCINI A 



(5. Puccinia Absinthii DC. 



Trichobasis Artemisiae Berk. ; Cooke, Micr. Fung. p. 223. 

 Puccinia Discoideamm Link ; Cooke, Micr. Fung. p. 206. 

 /'. Tanaceti Plowr. Ored. p. I s '-' p.p. Sacc. Syll. vii. 637 p.p. 

 /'. Absinthii DC. Flor. fr. vi. 56. Sydow, Monogr. i. 11. Fischer, 

 Ured. Schweiz, p. 188, f. 148. 



Uredospores. Sori generally hypophyllous, on yellowish- 

 brown or indeterminate spots, scattered or aggregated, not 

 confluent, minute, roundish, pulverulent, pale-brown; spores 

 globose to ovoid, echinulate, pale yellowish-brown, 20 — 35 x 

 15 — 26 ft, mostly with three subequatorial germ-pores. 



Teleutospores. Sori amphigenous, but generally on the 



lower surface or sometimes on the 

 stems, similar to the uredo-sori but 

 occasionally confluent, soon naked, 

 dark-brown or blackish ; spores oblong 

 to oblong-clavate, rounded and thick- 

 ened (3 — 7 yu.) above, constricted, 

 slightly attenuated below, the upper 

 cell punctate or verruculose, the 

 lower frequently smooth, especially 

 at the base, brown, 38 — 62 x 20 — 

 27 fu. : pedicels hyaline, thick, persis- 

 tent, as much as 80 /j, long. 



On Artemisia Absintliivm, A. 

 maritima, A. vulgaris. July — Sep- 

 tember. Rather uncommon. Also 

 recorded in Switzerland on A. campestris. (Fig. 86.) 



Fig. 86. P. Absinthii. Teleu- 

 tospores, on A. Absinthium. 



The germ-pores of both kinds of spores are covered with paler, swollen 

 caps. P. Tanaceti, which was formerly united with this species, possesses 

 on the average narrower and shorter teleutospores, though in each these 

 spores are said to be marked in a similar way, chiefly in the upper half. 

 But the markings of P. Absinthii are stronger and less likely to escape 

 observation, especially on the pore-caps of both cells. 



Distribution : Europe, Siberia, Japan, North America 



