ON THE GERMINATION OF THE UREDINES. 
141 
manent spore as we commonly meet with it (plate 159. figs. 22, 23, 
and 24). 
The following are the species of Uredines which were made the 
subject of study : — 
Uredo of Phragmidium mucronatum , Link. 
Puccinia graminis , Pers. 
„ Epilobii, D.C. 
„ Arundinacea , Hedw. 
striola , Link. 
Uromyces appendiculata , Lev. 
Coleosporium tussilaginis , Lev. 
„ Sonchi , Tul. 
,, Senecionis , Schum. 
Puccinia malvacearum , Corda. 
,, Epilobii, D.C. 
Coleosporium Sonchi, Tul. 
„ tussilaginis , Lev. 
,, Senecionis, Schum. 
AEcidium berberidis , Pers. 
,, tussilaginis , Pers. 
„ crassum, Pers. 
„ urticce , D.C. 
Peridermum pini , Chev. 
Explanation of Plate 159, 
Fig. 1. — A spore of Uredo 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.). 
Fig. 2. — Two spores of JEcidium berberidis with minute spherical secondary 
spores (P) adhering to them. 
Fig. 3. — A group of these bodies, secondary spores (?). 
Fig. 4. — A spore of Uredo 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. 
Fig. 5. — Germinating spore of Uredo linearis (23 hours). The distal ex- 
tremity of the tube contains 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. 
Fig. 6. — A spore of Uredo linearis (24 hours), showing the trifurcation 
which not uncommonly takes place ; one of these branches has 
gone on growing, but the walls of this portion of the tube are 
thinner and much more irregular in outline than the older 
portions. The endochrome has all accumulated in this part of 
the tube. 13th August, 1881. 
Fig. 7. — A spore of Uredo linearis (20 hours) in this germinal tube has 
taken three perfect turns upon itself. The hollow basal por- 
tion 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. 
