BULLETIN OF THE BUSSEY INSTITUTION. 411 
California certainly seem to strengthen Tulasne’s suspicions; and we 
must confess ourselves quite unable to distinguish between Fumago 
salicina —found on willows, oaks, birches, hawthorn, quince, and pear 
—and Capnodium Citri, found on oranges, and, as the Californian speci- 
mens 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 Fu- 
mago salicina, which, in the conformation of its mycelium, its conidia, 
pycnidia, and stylospores, 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 undoubtedly 
a single species. Neither is the fact of the branching of the stylo- 
spores very significant, as, in the present case, there are both simple 
and branching stylospores. If the reader will compare our Plate 1, 
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 particulars, 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, e¢, 
would seem to be the early stage figured by Tulasne, |. c., 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 con- 
sideration of the systematic position of the fungus, it was for the pur- 
pose of bringing out more forcibly the fact that it is nothing 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 suddenly increase to such an extent as to injure two important 
crops? We remarked, in passing, that the hyphz seemed to be, as it 
were, gummed to the stellate hairs, and, in some cases, to one an- 
other, by a sticky substance. We do not forget, that, when any myce- 
lium is growing on a leaf, a certain amount of dirt — including, of 
course, some oily matter — is sure to be entangled in its meshes. In 
the case of the present fungus, however, there is something more than 
an accidental accretion of such substances. The surface of the leaves 
