688 Transactions. { 
X. Mesospores uncommon, elliptical, 22-28 x 17-22 mmm. : rounded, 
or sometimes truncate at the apex, not thickened. 
Host: Cnicus arvensis Hoffm. On leaves and stems. Herb. No. 22]. 
П, III. Weraroa (Wellington), А. Н. Cockayne! 9 May, 1919. Roxburgh 
(Otago), J. Fleming! 17 Jan. 1921. Turakina (Wellington), $.. A. 
Cunningham! 4 Dec., 1921. 
Distribution: Europe; Siberia; North America; Japan; Australia. 
The host is introduced, and is a troublesome weed throughout the 
agricultural areas of New Zealand. The rust is of considerable economic 
importance, as once it has become established in a patch of thistles it 
persists year after year and prevents seed-formation in the flowering- 
heads. Infected plants may readily be recognized, as they become etiolated 
and lighter in colour than normal plants. pe 
| . There are two distinct phases in the life-cycle of this species. Early 
is done to the plant. This phase is not accompanied by spermogones. | 
Infection from the teleutospores of these secondary sori occurs the following 
Spring, when the young shoots and plants are infected. At one time It 
was believed that this rust was perpetuated by means of hybernating 
mycelium in the rhizomes; later investigations have disproved this theory. ` 
The verruculose epispore, non-thickened apex, and re ar, elliptical shape 
of the teleutospore characterize this бене. ; Mode. 
96. Puccinia pounamu n. Sp. (Fig. 74.) 
0. Spermogones hypophyllous, Sparse, scattered, immersed, honey- 
coloured. 
what longer than upper; slightl А . epe 
: , У or not constricted at the septum; ер 
spore smooth, tinted brown, almost hyaline, 2-2-5 mmm. thick ; pedicel 
persistent, hyaline, stout, up to 50x 12mmm., continuous with spore; y и 
germ-pore o. 
septum, obscur 
Host : southlandicus Cockayne. On leaves. Herb. No. 426. 
P ost: Senecio 4 ; ( 
ТОЛА mato Valley (Otago), 500 m. W. D. Reid! 5 April 1921. m 
The host is endemic. 
The teleut о 
EL À 3*- 5.1 : M ather 
1 pores g diately on reaching maturity. Ar 
conspicuous erue 18 the presence, in à number of spores, of an inflated 
pedicel (fig. 74) 
racterized by the smooth epispore, thick apex, attenuate base, and a 
stout persistent pedicel of the teleutospore 
d f upper cell apical, obscure, basal pore immediately below. 
e. 
ieee 
