W. G. Farlow—Disease of Olive and Orange Trees. 48 
We have not been able to find any recorded instance of asci 
having been found in Capnodium Cite Tulasne remarks,— 
uite pertinently, as it seems to us,—that, until better known, 
apnodium Citri and Antennaria eleophila can scarcely be con- 
sidered distinct from Fumago salicina.* The specimens from 
California certainly seem to strengthen Tulasne’s suspicions; 
and we must confess ourselves quite unable to distinguish be- 
tween Fumago salicina—found on willows, oaks, birches, haw- 
thorn, quince, and pear—and Capnodium Citri, found on oranges, 
and, as the Californian specimens show, also on olives. If it be 
said that no asci have been seen by us, that is no reason why the 
fungus should be removed from Fumago salicina, which, in the 
conformation of its mycelium, its conidia, eam and stylo- 
spores, it most closely resembles. Evidently, in the group of 
fungi which we are considering, too much stress must not be 
laid on the length and shape of the stylospores. We see, in the 
specimens before us, how great is the variation in what is un- 
doubtedly a single species. Neither is the fact of the branch- 
ing of the stylospores very significant, as, in the present case, 
there are both simple and ‘Sianalaitg stylospores, If the reader 
will compare our Plate 3, Fig. 1, with that of Fumago salicina, 
by Tulasne, “Carp. Fung.,” Plate XXXIV, Figs. 14 and 20,— 
leaving out of sight, as far as possible, the different artistic merits 
of the two,—we think he will admit that, in all essential partic- 
ulars, they are alike. In reality, the resemblance is even greater 
than the limited size of our drawing would indicate. We have 
said that we found no asci; but Plate 1, Fig. 1, c, would seem 
to be the early stage figured by Tulasne, | ¢. Fig. 20. The 
asci will probably be found in California; and we do not doubt 
that they and their contained spores will prove to be like those 
of Fumago salicina. : 
If we seem to the reader to have gone too minutely into the 
consideration of the systematic position of the fungus, it was for 
the purpose of bringing out more forcibly the fact that it is noth- 
ing new, or peculiar to California; and that it is not even limited 
to orange, lemon, and olive trees, but, as we have seen, is found 
on a number of other ‘trees. How does it happen, then, that a 
fungus so widely diffused should sudden! a gtr to such an 
extent as to injure two important‘crops? We remarked, in pas- 
po hae the hyphz seemed to be, as it were, ome to the 
te hairs, and, in some cases, to one another, by a sticky sub- 
Stance. We do not forget, that, when any mycelium is grow- 
mg on a leaf, a certain amount of dirt—including, of course, 
Some oily matter—is sure to be entangled in its meshes. In the 
* “Donec melius tur, a Fumagine descripta egre 
discriminantur, nisi sede ibi singulis is assueta, tum Fiwmago Citri, Persoonio seu 
Capnodium, Oiiri Montanio; tum etiam Antennaria Montanio,” £0. (Sel- 
ecta Fungorum Carpologta, pp. 283, 284.) 
