284 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI, 
without a winter’s rest. The further development of the sporidia abscised from the 
promycelium is perfectly known, at least in L. Dianthi, L. Malvacearum, and L. 
Circaeae; the germ-tubes from the sporidia penetrate at once into the proper host, 
either through the wall of an epidermal cell, as in L. Malvacearum, or through a 
stoma, as in L. Dianthi, and develope a mycelium which again produces only teleuto- 
spores. Aecidia and uredines have never been observed in these species. 
A similar relation to this between the Puccinieae which form aecidia and 
Leptopuccinia exists between the Chrysomyxae and Leptochrysomyxa. The former 
(Chrysomyxa Ledi and Ch. Rhododendri) form aecidia, teleutospores, and uredines 
in the regular succession. The teleutospores (Figs. 130, 131) are cylindrical cells with 
soft colourless membranes forming simple or branched pluricellular rows, which stand 
densely crowded together parallel to one another and perpendicular to the surface of 
the hymenium. They germinate as soon as they are ripe, and where they are formed. 



FIG. 130. Chrysomyxa Rhododendr: in a leaf of RA. hirsutum, Vertical section FIG. 131. CArysomyxa Rhodo- 
igh a lay e—¢ epidermis of the under surface of the leaf. Adjoining dendri. A single isolated row of 
the spores is the tissue of the leaf traversed and distorted by mycelial filaments 7 of Me after letion of 
Chrysomyxa; a a row of teleutospores which have not yet germinated; / a similar row germination and shedding of the 
in which the uppermost teleutospore has formed a promycelium, and on this sterigmata sporidia, 
and sporidia are beginning to be formed in basipetal succession. Most of the other rows 

show the first ofthe ion of promycelia on the upp teleuto- 
spore. Magn. 140 times, 
Leptochrysomyxa (Chrysomyxa Abietis, Unger) forms exactly the same teleutospores 
with promycelium and sporidia, which are scarcely distinguishable from those of 
the two former species. But the germ-tubes from the sporidia produce mycelia 
which only form teleutospores; no aecidia or uredines have ever been observed on 
them. 
It is evident that the provisions for the life of these species are different from 
those of the species first described. This however might be the case while the 
morphological conditions remained the same; but here there is the important 
difference, that the whole aecidium-generation is passed over and struck out of the 
cycle. It may be that it does occur in some Leptopuccinieae which have not been 
thoroughly examined as much as in Puccinia Berberidis, and that we merely have 
not yet learnt the place and the conditions of its occurrence. We may allow the 
possibility of this even in the four last-named species, which have been very often and 
very thoroughly examined and in which there is no indication of any formation 
