24 Transactions. 
Н. H. Allan! Feb., 1920.  Makarora (Otago), W. D. Reid! 25 Mar., 
1921. Tokaanu-Waiouru Road, Taupo, 400 m., E. H. Atkinson! 11 Mar., 
1922. 
Distribution : det Queensland. 
The host is endemic, and is common throughout. (Cheeseman, 1906, 
p. 125.) The pore stage only has been collected in New Zealand ; 
this i is common, and is readily observed owing to the conspicuous nature of 
the spore-masses 
The description of the uredospores given above is an up from infor- 
mation kindly supplied by Mr. C. C. Brittlebank, Melbou 
The spores and bow pedicels are inextricably DOG. into filaments, 
so that it is di t to separate out single spores for the purposes of 
measurement and nndis These filaments are formed in the following 
manner: The sori are at first bullate and covered by the epidermis ; this 
soon becomes ruptured, owing to the increasing pressure exerted by the 
developing spores, and the spores become exposed, when they are seen as a 
vinate mass standing above the leaf-surface about 0-5 mm. Spores are 
being produced from the same sorus during the whole of the summer months, 
and appear to be developed in batches. As each successive batch develops, 
the spores become forced between the pedicels of the preceding batch,, 
which are consequently carried upward away from the base of the sorus. 
Gradually the filament becomes formed, and, as the spores and pedicels of 
successive batches are closely interwoven, the filament does not break up, 
but remains compact, and may persist for several seasons, i ek if it 
happens to become entangled with the spines which cover the under- 
surface of the leaf. The filaments do not, as a rule, remain för any length 
of time attached to the sori, so that they may frequently be seen on the 
same leaf with the detached filaments. The empty sorus usually contains 
numerous incurved, cylindrical paraphyses. Germination occurs as soon 
as the spores mature, and, as spores of all ages usually occur in the same 
filament, different Sess of development may readily be obtained. The 
first indication of germination is the appearance of a slight swelling on one 
side of a cell; this is followed by the gradual development of the basidium, 
which protrudes at this point. At first unicellular, the basidium soon 
ecomes four-celled by the NS oat e пеш septa. Shortly after 
the septa appear the sterigmata grow e from each cell of the 
asidium ; on each a small, sati Wald: c us basidiospore appears. 
The basidia are allantoid, and may attain a size of 60 x 10mmm.; the 
basidiospores are obovate or reniform, and usually 15 x 10 mmm. 
Until 1912, when Р. and Н. Sydow (/.с.) separated the species described 
above, one species only was known. This was by Thuemen in 1875 (Flora, 
vol. 58, p. 379) described as Phragmidium longissimum. Two years later 
Koernicke (Lc.) placed it in Hamaspora, a genus he erected to contain it 
and another form with similar diei (now Gymnosporangium Ellisii Faxl.). 
In 1888 De Toni (in Sacc., Syll., vol. 7, p. 750) compiled it under Phrag- 
midiwm. Massee in 1893 (Grev., vol. 22, p. 17) considered that it was 
Phragmidium, although he recognized a resemblance to Gymnosporangium 
in the teleutospore structure. McAlpine (1906, p. 187) in 1906 included it 
under Phragmidiwm, but mentioned the fact that it differed considerably 
from other species included in that genus. 
