622 Transactions. 
upwards until a small blister is formed; this soon ruptures and exposes 
the uredospores. The mass of uredospores and their pedicels, together 
with the accompanying paraphyses (when present) collectively form the 
uredosorus. Mature sori are invariably surrounded and partially covered 
by the ruptured epidermis (Plate 77, fig. 3). Each uredospore is, as a rule, 
elliptical or subglobose, and consists of a coloured, echinulate epispore 
(text-fig. 5, A, c), perforated with one or several germ-pores, and containing 
the colourless, granular, and oily cell-contents. In certain species a thicker- 
walled spore, capable of remaining viable for a much longer period, is pro- 
duced; this is termed an amphispore. Uredospores may remain viable 
but a short time, or may be capable of germination after a period of several 
months. Doubtless many of the rusts introduced into New Zealand are 
perpetuated by these spores alone, as their aecidia are absent, and their 
teleutospores are, in consequence, pre- 
sumably functionless. From the same 
uredosori successive generations of 
b 
attached to their pedicels, and, being 
7*8 readily detached, are carried by wind 
to other plants in the vicinity, and, 
if the hosts are suitable, give rise to 
uredosori. It is by this stage that 
many of the rusts are so widely distri- 
buted ina single season. Later in the 
ле -eh season, in response to some stimulus, 
Eus the teleutospore, or final spore in the 
cycle, is produced. Teleutospores may 
d--- arise in sori produced directly from 
B uredospore infection, or may be pro- 
Fic. 5.—A. Germinating uredospore from duced in the sori which have during 
Anisotome aromatica Hook. f. : a, germ- ће earlier part of the season produced 
tube з d germ - pores; c, epispore;  uredospores. Teleutosori are, as а 
f Puccinia novae-zelandiae m. sp.: : 
b, zerm-pore; g, septum; h, pidea: but may generally be distinguished 
x 326. by their darker colour. In the sori 
so the cycle recommences. 
