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EXPLANATION OF PLATE. 
1.—A spore of Uvedo linearis germinating. Two tubes have been thrown out, one from 
each side the spore near its centre. Each tube is filled with yellow endochrome 
from the interior of the spore (5 hours 4 min.). 
2.—Two aoe of Acidium berberidis with minute spherical secondary spores (?) adhering 
to them. 
3.—A group of these bodies, secondary spores (7). 
4.—A spore of Uvedo linearis (20 hours), from which two tubes have, in the first instance, 
been thrown out ; one only has developed, and towards the end of this the yellow 
endochrome is being passed. ‘The base of this tube is cut off by a septum, below 
which it is empty, as is the abortive tube. 
5.—Germinating spore of Uvedo /inearis (23 hours). The distal extremity of the tube con- 
tains all the endochrome. ‘The walls of the tube here show signs of incipient 
branches. The tube has taken two spiral turns from left to right. 
6.—A spore of Uvedo linearis (24 hours), showing the trifurcation which not uncommonly 
takes place ; one of these branches has gone on growing, but the walls of this por- 
tion of the tube are thinner and much more irregular in outline than the older por- 
ie The endochrome has all accumulated in this part of the tube. 13th August, 
7. A-spore of Uredo linearis (20 hours), in this germinal tube has taken three perfect turns 
upon itself. The hollow basal portion shows indications of two additional, but 
abortive, tubes. The endochrome should have been shown confined to the trident- 
like part of the tube. 22nd August, 1881. 
8.—Shows the further development of a germ tube; the extreme end only is shown. The 
tube here consists only of a very thin wall, in which, however, all the endochrome 
has accumulated. But it has thrown out numerous branches at right angles to the 
growing axis. The extreme end still retains its tendency to convolute. 22nd 
August. 
Figs. 10, 11, and 12 show three examples of Uvedo dinearis in which, instead of producing 
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the thin-walled, irregularly-branched (‘‘stag’s horn”) extremities, the endochrome 
has accumulated in globular expansions of the germ tube. In figs. 11 and 12 
secondary globes are just beginning to be formed. The tubes are themselves quite 
empty, all the endochrome having accumulated in the globose expansions, which 
consequently have a distinct yellow colour. 13th August, 1881. 
13.—A spore of Aeidium tussilaginis which has germinated very actively in 10 hours. The 
germ tube has taken eight or nine spiral turns, at first from left to right, then re- 
versing its movement, has turned from right to left. The endochrome has accu- 
mulated entirely at the extreme end. 
14.—Spore of Coleosforium sonchi arvensis, after 24 hours. The two upper segments of the 
spore are quite empty, all their contents having been removed to the germ tubes. 
The apical tube is given off from the end of the spore, the other laterally. The 
analogy between the germination of this spore and of these figured at 10, 11, and 
12 is very striking. 
15.—Spore of 4cidinm tussilagints (16 hours), in which the endochrome is seen passing 
up the tube, but has not yet reached the extremity, 
16.—Spore of 4cidium tussilaginis, in which the primary tube has divided into two equal 
branches, each of which has taken on independently spiral convolution (40 hours). 
17.—Spore of cidium tussilaginis which, in 40 hours, has thrown out a tube that has 
undergone very irregular spiral convolutions. 
18..—Spore of eidium crassum in which germination has just commenced, It is impossible 
to say which of the budding tubes will eventually develope, but one, or at most two, 
will do so. 
19.—Germinating spores of Coleosporium tussilaginis (uvedo), 48 hours. 
20.—Germinating spore of Puccinza epilobiz (72 hours) producing two secondary spores. 
21.—Spore of Puccintia epilobit which, in 48 hours, has thrown out one wide and two narrow 
tubes ; the former will produce secondary spores (puccinoid germination). 
22.—A spore of Puccinia eptlobiz, in which both segments have thrown out tubes; in the 
upper tube a uniseptate intercalated spore is seen, 15 mk. long by 5 mk. wide. 
23.— Germinating spore of Uvede /abe, with intercalated spore (15 x 8 mk.), 96 hours. 
24,—Germinating spore of 4cidium berberidis with intercalated spore (20 hours). 
25.—Germinating spore of Puccinia graminis taken from Tulasne. The tube from the 
upper segment is broken off, while that from the lower segment is seen in its upper 
part to be divided by three septa. From each division a pointed branch arises, 
which bears at its extremity an oval or subreniform secondary spore. 
