73 
and finally exposing nearly the whole hymeneal layer by the free edges 
approaching the sides in a compact roll; formed from the blackened 
and slightly changed cuticle of the host; on the upper surface granu¬ 
late, below irregularly tuberculate, not distinctly cellular; basidia 
hyaline, clavate, cylindrical or somewhat irregular, continuous or some¬ 
times apparently sparingly septate, very numerous, densely crowded, 15- 
25 by 2-4/*; sporules hyaline, ovate, clavate, cylindrical or sometimes 
oblong or oval, attached by the smaller end, bluntly rounded at both 
ends, often slightly inequilateral, 7J-11 by 3-5/*, mostly 8-10 by 3£- 
4^/*, wall very thin, smooth, contents minutely many-guttulate, especially 
at the ends. On galls caused by some species of Phytoptus on the 
upper side of the leaves of Vlmus Americana , Manhattan, Kans., May 
and June, 1889. (No. 1493.) The basidia of this species are formed be¬ 
tween the epidermal cells and the cuticle in almost exactly the same way 
as in some species of Taphrina. The mycelium is formed, chiefly be¬ 
tween the cells, for a considerable distance from the perithecia. It is 
hyaline, many septate, rather coarse, and often much twisted and con¬ 
torted. This species differs from most of the Sacidii in having, appar¬ 
ently, no true peritlieci um. However, the related genus Leptothyrum 
has such species. 
The galls which it attacks are not those caused by Phytoptus ulmi. 
They are much larger and differ in shape from the galls caused by that 
species. They are “nail galls” about 5-10 by 2-4 mm , usually acute or 
subacute at the top and abruptly narrowed and nearly closed at the base 
The sides are usually more or less angled or ribbed; often several galls 
become attached to each other or spring from a common base without 
becoming attached above. 
Oylindrosporium triostei, n. s. Spots indefinite, amphigenous 
but more prominent above, yellowish green, at first small (£-2 mm in 
diameter), sometimes at length becoming confluent and from 2-5 ram in 
diameter. Usually sparse, scattered irregularly all over the leaf; acer- 
vuli, amphigenous, but often larger and more numerous below, sparse, 
at first subepidermal then erumpent, about 150-300/* in diameter, pale 
yellowish white; hyphae pallid, abundant, rather irregularly and spar¬ 
ingly branched, variable in diameter, often larger above, about 15-30 
by 3-5/*, arising from a dense pseudo-parenchymatous mass of hyphae 
which at first issue through the stomata but soon force themselves 
through the epidermis all around finally pushing it away ; conidia ter¬ 
minal on the hyphae or branches, subpersistent, abundant, in mass of 
a pale cream color, when seen singly subhyaline, elongate-fusoid, very 
strongly and regularly curved or rarely only slightly curved, ends rather 
obtuse or sometimes acute, the free end being the most acute, 3-7 
(mostly 4-f>) septate, not constricted at septa, rather regular in size, 
35-07 by 4-0/*, mostly 45-57 by 4-5/*. Very rare on leaves of Trios- 
teumperfoliatum. Manhattan, Kans., August 24, 1887. This species 
seems to be extremely rare, a few specimens were seen and conidia 
