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There first appears upon either the upper or lower surface of 
the leaves, more particularly upon the latter, and upon the young 
shoots, small, light colored wart-like excrescences. These ex- 
crescences increase in number and size, the approximate ones 
often running together, until the whole surface is covered, de- 
stroying, of course, the vitality of the leaf. When young leaves 
are attacked they become more or less distorted, and their full 
development is prevented. The top of the older warts, if one 
may so term them, are dark brown, or nearly black, due to the 
presence of a dense fungus growth, which exhibits under the 
microscope, a multitude of irregularly developed conidiophores, 
bearing oblong, oval one-celled conidia. Such low forms as 
here presented are almost unnameable, and are quite beyond 
definite classification, yet they are often among the most inju-_ 
rious of fungi; but whether this particular fungus be the cause of 
the disease it accompanies I cannot at present say. Upon some 
diseased specimens recently received from Ocala, Fla., there was 
discovered a species of Fusarium, which Mr. J. B. Ellis, to whom 
samples were submitted, believes to be identical with /. sar- 
cochroum, Desm., and he expresses the opinion that the tubercles 
are caused by the mycelium of this fungus, these being the first 
outward manifestations of its growth. 
It may be going too far to advance any opinion at this time, 
but I will say that after making many careful examinations of 
the samples received, Iam disposed to think that the injury in 
question is occasioned by the first fungus referred to above, the 
hyphz and spores of which are present in greater or less abun- 
dance on all the more developed excrescences. 
From letters received from Mr. C. F. A. Bielby, of De Land, 
Fla., we learn: First—That the trees most severely affected 
with this leaf disease last season suffered more than those not 
affected, during the winter. Second—Trees affected last season 
are the ones first attacked this spring, although the foliage of 
these is entirely new growth. 7zrd—So far as observed, sour 
trees alone are affected. Fourth—Location and nature of the 
soil, or of the fertilizers used, have no influence on the disease. 
Fifth—The most vigorous as well as the “sickly” trees are alike 
affected. Sixth—lIfa tree is diseased in part the tendency is for 
