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EXPLANATION OF PLATE IV. 
ILLUSTRATING PROFESSOR SEWARD’S PAPER ON “A BRITISH 
FOSSIL SELAGINELLA .” 
Selaginellites Dawsoni sp. nov. (The author is indebted to Mr. Hamshaw 
Thomas for the photograph reproduced in Fig. 7. Figs. 1-2 were drawn by 
Mr. Brock and Figs. 3-6 are from photographs by Mr. Tams). 
Figs. 1, la. Sterile Shoot. Fig. 1. Nat. Size ; Fig. la, x 3. 
Figs. 2, 2a. Fertile Shoot. Fig. 2. Nat. Size ; Fig. 2a, x 3. 
Figs. 3, 4, 5. Microspores. Figs. 3, 4, x 300; Fig. 5, x 100. 
Fig. 6. Megaspore, x 100. 
Fig. 7. Megaspore and microspores, x 100. 
THE EVOLUTION OF THE HIGHER UREDINECE. 
By W. B. Grove, M.A. 
[With Two Figures in The Text], 
O NE of the most pregnant phenomena attending the study of the 
Uredineae during the present century has been the discovery 
by Tranzschel of the heteroecism of Puccinia Pruni-spiuosce, the 
Plum Rust. He proved what was previously not even suspected, 
that it has its aecidial stage on Anemone coronaria. But it is not the 
fact of the discovery, but the method which led up to it, that is of 
the greatest importance. This method has already led to several 
important results and will undoubtedly lead to numerous discoveries 
in the future, but its present advantage is that it gives us a view of 
the evolution of the Uredineae which is based upon certain facts, 
and not upon uncertain speculations. 
The facts are these :—In Europe and North America Anemone 
nemorosa bears a Micropuccinia, known as Puccinia fusca Winter, 
which has teleutospores of a very uncommon character (Fig. 1, A), 
—they have the two cells for the most part globular (especially the 
upper one), divided therefore by a deep constriction, easily 
separating from one another, covered all over with rather large 
coarse warts, and attached in bunches of 10—20 by short pedicels to 
