OF А REMARKABLE UREDINE. 149 
5. At first the same portion of the same mycelium produces both spores (the species 
under consideration). 
6. Later, on the principle of the physiological distribution of function, separate 
portions of the same mycelium form the separate spores (through Р. Berberidis 
to the more ordinary forms). 
7. Later still, to aid in the struggle for existence, where the distribution of species 
becomes important, separate mycelia produce separate spores (most autcecious 
species). 
8. With increasing struggle for existence, hetercecism with increased necessity for 
aid in distribution, 4. e. for the production of uredospores (most heterocious 
species). | 
But, аз I have said, there are grounds for thinking that Z»dophyllum should not be 
regarded as the starting-point in this evolution. If the ecidial fructification had been 
the most essential, it is not probable that it would have been thrown out in any species ; 
and yet in Puccinia Collettiana, as I have shown *, and as others have shown, I believe, in 
other cases, this has happened, and no vestige of it is left. Indeed, as Dietel points 
out t, the only spore-form, which, as far as we know, is invariably present, is the 
sporidium, the product of a teleutospore, and Brefeld has advanced strong arguments 
for regarding every other form of spore as subsidiary. : 
Endophyllum, in this view, must be regarded as an aberrant branch, and it would 
perhaps be more correct to look upon the Jasmine secidium as tending in the same 
aberrant groove. It is conceivable that, if the mycelium acquired a perennial habit, as 
has been acquired by JE»dophyllum, the formation of teleutospores would become un- 
necessary, and would therefore cease to be formed. In that case our fungus would 
become practically an Hndophyllum. 
It is worthy of remark that in this species the sporidium and the. ecidiospore are 
physiologically almost equivalent, as each produces a like mycelium, with this difference 
only, that while the mycelium produced by a sporidium bears spermatia, that produced 
by an zecidiospore does not. Аз this is the second Uredine in which I have observed 
this peculiarity I would draw particular attention to it. I first noticed it in the life- 
history of P. Collettiana T. In this species also the sporidia form mycelia bearing 
spermogonia; but the mycelia produced by primary uredospores, though like the former 
mycelia in every other respect, bear no spermatia. If further investigation should show 
that the same occurs in all similar cases (members of the groups Brachyuromyces, 
Brachypuccinia and Uromycopsis, Pucciniopsis, Schróter) this would give additional 
support to Brefeld's view that spermatia and sporidia are spores of a like kind (conidia) 
differing from the remaining forms of spores in this order (chlamydospores). 
The whole life-cycle of the species under consideration may begin with the æcidio- 
spore, ending with a sporidium, or, beginning with a sporidium, end with a teleutospore ; 
* «Scientific Memoirs by Medical Officers of the Army of India,’ pt. v. 1890, рр. 87-91. 
Т “ Beiträge zur Morphologie und Biologie der Uredineen," a series of seven papers in the * Botanisches Central- 
blatt, xxxii. $ Loe. cif. 
SECOND SERIES.—BOTANY, VOL. III. : х 
