90 
W. B. Grove. 
a common base. The teleutospores are accompanied by spermatia, 
but by no other spore forms. Now the teleutospores of P. Pruni- 
spinosce (Fig. 1, B) on Primus are absolutely identical with these, 
although they are accompanied (contrary to those of P. ftiscn) by 
uredospores and not by spermogones. These uredospores (Fig. 
1, C) are also of a very uncommon shape ; they have the cell-wall 
conically thickened at the apex (after the style of many teleuto¬ 
spores of Uvomyces or Puccinin), and are provided with downward- 
turned spines which are larger in the lower half of the spore than 
towards the summit. They are in fact closely similar to amphispores. 
They are also accompanied by numerous capitate paraphyses. 
Furthermore, there is on Anemone coronaria an aecidium (/.E. punc- 
tatum Pers., AE. quadrijidum DC.) accompanied by spermogones, 
which had hitherto stood isolated, not being followed by any other 
spore-form on the same plant. It occurred to Tranzschel, reasoning 
merely from the similarity of the two teleutospores, that this aecidium 
belonged to P. Pruni-spinosce (24). The idea was without delay 
proved by experiment to be a fact, which has since been substanti¬ 
ated by other observers (3). Thus it is shown that P. Pruni-spinosce 
is a hetercecious species, having its spermogones and aecidia on 
Anemone and its uredo- and teleutospores on Primus. 
Fig. I. Teleutospores of Puccinia fusca 'A), P. Pruni-spinosce (B), P. cohcesa 
(D), P. Tkalictri (E), P. coronata (F), P. Mesnieriana (G), P. albescens (H), P. Adoxce 
(J), and P. argentata (K), and Uredospore of P. Pruni-spinosce (C). D is from an 
original specimen collected by Long. H, J, and K are selected specimens, 
but are fairly representative of each type. A to G, x 660 ; H, J, K, x 900. 
