334 ENDOPHYLLUM 
Teleutospores. Sori hypophyllous, or occasionally epiphyllous, 
more or less covering the whole surface, crowded, zcidium-like, 
sunk in the leaf-tissue which is slightly swollen, surrounded by 
a thin peridium in the shape of a shallow cup, with a short, 
Fig. 251. EH. Euphorbiae-silvaticae. wu, affected leaf of E. amygdaloides, 
nat. size; b, secidio-teleutospore; c, germinating spore; d, another, not 
so advanced, x 540; ¢, inner, and f, outer wall of peridium-cell, x 600. 
torn, slightly revolute margin; spores in evident chains, bluntly 
polygonal or subglobose, densely but finely verruculose, orange, 
18—23 w; epispore about 1 thick; basidiospores obovate, yellow. 
On Euphorbia amygdaloides (= E£. silvatica). Rather un- 
common. April—June. (Fig. 251.) 
The mycelium usually perennates in the plant. The affected shoots 
are taller than the normal ones, with shorter, wider and paler leaves; 
they seldom flower. This species externally closely resembles an acidium, 
and can be distinguished from one only by the different mode of germina- 
tion of the spores. The ecidia which occur on other species of Zuphorbia 
belong to different life-cycles, Uromyces Pis? etc. ; 
The peridium of this species is more strongly developed than that of 
the following one; its cells are densely warted, and arranged in distinct 
rows. A long account of the behaviour of the parasite is given by 
Plowright (/.c.). The spores germinate readily in the summer as soon 
as produced. 
DISTRIBUTION: Europe. 
