22 Transactions. 
that it is а a Phragmidium becomes obvious when the following facts are 
consider 
(a.) Sorus characters: The teleutospores are early aggregated into 
fibrillose filaments 8; in mass they are pallid yellow (cream or 
white with age), not dark coloured. 
(b.) The "ев are accompanied by the spermogones, caeomata 
being à 
(c.) The shape E the teleutospore does not resemble any species of 
Phi ium, although approaching certain species of Gymno 
spor angi 
(d.) The pec ge non-laminate wall of-the teleutospore differs from any 
-species of Phragmidium, but approaches Gymnosporangium. 
(e.) The presence of a solitary germ-pore in each cell is a character not 
present in any Phragmidium, and occurs in only a few species of 
Gymnosporangium. Moreover, with these two genera the pores 
are usually conspicuous, тыноо with Hamaspora the pores are 
visible only at germinatio 
(f.) The method ot germination “differs slightly from Phragmidium, but 
considerably from that of Gymnosporangium. 
(g.) The pedicels are of an extraordinary length, and taper gradually to 
a fine point. 
From a consideration of these facts it would appear that, morphologically, 
the teleutospores more closely resemble Gymnosporangium than the 
o Phragmidium, and that in behaviour towards their hosts (e. g., being 
autoecious instead of heteroecious) a and in the method of germination they 
more closely approach Phragmidium 
1. Hamaspora acutissima Sydow. (Text-figs. 94, 95, and Plate 1, fig. 4.) 
Rosaceae. 
Syd., Mon. Ured., vol. 3, p. 80, 1912. 
0. Spermogones immersed, hypophyllous, associated with the uredosori. 
II. Uredosori hypophyllous, scattered, orbicular, 0:25—0:5 mm. diam., 
golden-yellow ; surroun and mixed with numerous incurved hyaline 
cylindrical paraphyses. ace globose, obovate, or shortly elliptical, 20-25 
x 17-19 mmm. ; epispore hyaline, finely and densely verruculose, 2 mmm. 
thick, thickened at the apex to 3-5mmm., cell-contents pallid yellow ; 
germ-pores scattered, 6—8, obscure. 
III. Teleutosori hypophyllous, scattered or crowded in irregular groups, 
seated on indefinite pallid spots which are visible on the upper surface, 
elliptical, 0-5-1 mm. diam., pulverulent, surrounded by ve an epi- 
dermis. Spores aggregated into pallid-yellow fibrils up to . long, 
fading with age, 4-6-celled, long-cylindrical, 100-180 x 14-22 mmm. ; apex 
strongly acuminate, tapering to a fine sharp point, thickened up to 10 mmm. » 
base truncate; not constricted at the septa; epispore hyaline, smooth, 
lmmm. thick, cell-contents orange, granular; pedicel persistent, con- 
tinuous with the spore, tapering basally to a fine point, up to 600m 
long, 10-15 mmm. thick immediately below the spore, hollow ; germ- pore 
solitary in each cell, indistinct. 
Host: Rubus australis Forst. f. On leaves. Herb. Nos. 7, 594. 
e : Islands, T. Kirk! 1882. Mount Waiopehu (Wellington) 
G. H. Q. 26 Oct., 1919. Otira Gorge (Canterbury), 500 
Е es "Atkinson! 30 Jan., 1920. Peel Forest (Canterbury), 250 m m., Е 
