142 
ON THE GERMINATION OF THE UREDINES. 
Fig. 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 accumula- 
ted. 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 Uredo linearis in which, in- 
stead of producing the thin-walled, irregularly branched 
(“ stag’s horn ”) extremities, the endochrome has accumula- 
ted 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. 
Fig. 13. — A spore of JEcidium tussilaginis which has germinated very ac- 
tively in 10 hours. The germ tube has taken eight or nine spiral 
turns, at first from left to right, then reversing its move- 
ment, has turned from right to left. The endochrome has 
accumulated entirely at the extreme end. 
Fig. 14. — Spore of Coleosporium 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 those figured at 10, 11, and 12 is very striking. 
Fig. 15. — Spore of JEcidium tussilaginis (16 hours), in which the endo- 
chrome is seen passing up the tube, but has not yet reached 
the extremity. 
Fig. 16. — Spore of JUcidium tussilaginis in which the primary tube has 
divided into two equal branches, each of which has taken 
on independently spiral convolution (40 hours). 
Fig. 17. — Spore of Mcidium tussilaginis which, in 40 hours, has thrown out 
a tube that has undergone very irregular spiral convolutions. 
Fig. 18. — Spore of JEcidium crassum in which germination has just com- 
menced. It is impossible to say which of the budding tubes 
will eventually develope, but one, or at most two, will do so. 
Fig. 19. — Germinating spore of Coleosporium tussilaginis (uredo), 48 hours. 
Fig. 20. — Germinating spore of Puccinia epilobii (72 hours) producing two 
secondary spores. 
Fig. 21. — Spore of Puccinia epilobii which, in 48 hours, has thrown out one 
wide and two narrow tubes ; the former will produce secon- 
dary spores (puccinoid germination). 
Fig. 22. — A spore of Puccinia epilobii , 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. 
Fig. 23. — Germinating spore of Uredo fabce , with intercalated spore (15 X 
8 mk.), 96 hours. 
Fig. 24. — Germinating spore of 2Ecidium berberidis with intercalated spore 
(20 hours). 
Fig. 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 at 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. 
