LEndophyllum. 229 
Exsiccatt, 
Berk., 299. Cooke, i. 6; ii 302. Vize, “ Fungi Brit.” 154. 
“ Micro. Fungi Brit.,” 458. 
On Euphorbia amygdaloides. 
April to June. 
BIoOLOGY—The spores of this species germinate freely in water, and 
produce a promycelium with three or four promycelial spores. When 
placed on the cuticle of a leaf of the proper host-plant, these promy- 
celial spores bore, by means of their germ-tubes, through the epidermal 
cells and enter the parenchyma of the leaf, between the cells of which 
they soon produce a richly branched and widely. extending mycelium. 
If the entrance has been effected into-an old: leaf, the further develop- 
ment of the parasite ceases when the leaf falls off. The: mycelium 
passes along the petiole and enters the stem, where it may be found, 
especially in the pith and inner bark. In the following spring, the 
foliage which is produced by an infected, is different from that which 
is produced by a healthy plant. The affected plant sends up longer 
shoots, with shorter and wider leaves, which have a paler green colour 
than the hedlthy foliage (De Bary, Meue Untersuch., 1865, pp. 20, 21). 
I find that the promycelial spores often send out germ-tubes while 
still attached to the promycelium. I have always failed in permanently 
infecting old plants of Euphorbia ; no matter what the age of the leaves 
may be, in the ensuing spring the foliage has always been healthy. 
But if a young seedling be infected shortly after it has come up—that 
is, while not more than a month or two old—the mycelium produced 
in its leaves readily gains an entrance into the stem. The foliage, 
. and shoots sent up by it in the following year are pervaded by the 
perennial mycelium, and produce ecidia abundantly during the spring ; 
but the late summer and autumn foliage differs little from healthy 
foliage, excepting that the: leaves are somewhat shorter. The next 
vernal foliage is, however, zcidiiferous. The affected plants seldom 
flower. 
Endophyllum sempervivi. (Alb. and Schw.) 
Mycelium perennial. Spermogonia globose, then conical, yellow. 
Pseudoperidia scattered, immersed, at first papilleeform, open- 
ing above by a small foramen, then broadly cup-shaped, with 
whitish edges. Spores subglobose or angular, verrucose, 
orange, 20-30 in diameter, sometimes 30m long. 
