206 



PUCCINI A 



oblong i" clavate, rounded above and not thickened, evidently 



constricted, usually attenuated below, 

 smooth, brown, 55 — 90x20 — 35 yu. (or 

 even 1 00 yu, long); pedin -Is hyaline, per- 

 sistent, very long, (reaching 160 /*). 



On Buxu8 8emperviren8. Rather 

 common. September, October, lasting 

 through the winter and following spring. 

 (Fig. 153.) 



The spores of this species easily fall apart 

 into their component cells. Ed. Fischer proved 

 that it has only the one spore-form : he gives 

 (I.e.) figures showing the effect upon the leaf 

 of an infection by the basidiospores. Accord- 

 ing to him, the teleutospores germinate in 

 spring, and infect the delicate young leaves. 

 The mycelium grows slowly. During the 

 summer and autumn the infected spot becomes 

 much thickened : the sori are produced in late 

 autumn or during the following winter. This 

 is exactly in accordance with the suggestion 

 made by Plowright (I.e.), without any experi- 

 mental evidence being; at that time available. 



Fig. 153. P. Bu.ri. 

 Teleutospores. 



I Distribution : Europe and Persia. 



< 8. Puccinia Malvacearum Mont. 



Puecinia Malvacearum Mont, in Gay, Hist. Chile, viii. 43. Cooke, 

 Micr. Fung. p. 20-"> ; Grevillea, ii. 47, 137 and iii. pi. 35, pi. 49, 

 f. 1. Plowr. Ured. p. 212. Sacc. Syll. vii. 686. Sydow, Monogr. 

 i. 476. Fischer, Ured. Schweiz, p. 313, f. 227. McAlpifle, Rusts 

 of Australia, p. 178, f. 99, 100, 123—130, and pi. F, f. 28. 



Teleutospores. Sori hypophyllous or amphigenous, and on 

 the petioles and stems, on conspicuous yellow or orange spots, 

 scattered but close together, small, hemispherical or on the 

 stems elongated, pulvinate, compact, hard, at first pale-reddish, 

 then reddish-brown ; spores oblong to subfusoid, attenuated 

 at both ends or rarely rounded above, thickened at the apex, 

 gently constricted, smooth, yellowish-brown, 35 — 75 x 12 — 26 //.; 

 pedicels hyaline, persistent, short or as much as 150 /x long; 

 <>ne-, three-, or even four-celled spores also occur. 



