182 BOTANICAL GAZETTE [MARCH 
more or less close resemblance to Gloeosporium. ‘The Leptothyrium 
of Gnomoniella tubiformis is scarcely to be distinguished from a 
Gloeosporium; Asteroma of Gnomonia padicola differs from it 
only in the production of superficial mycelium; and Marssonina 
of Gnomonia leptostyla only in its two-celled conidia. 
Among the many fungous diseases occurring on the leaves of 
the elm, only a few have been found whose causative organisms 
are located in the Melanconiaceae. Three of these belong to the 
American flora, namely, Goryneum tumoricolum Peck, Septogloeum 
profusum (Ell. and Ev.) Sacc., and Cylindrosporium ulmicolum 
Ell. and Ev. I have not seen Exrtis and EvERHART’s specimen of 
Cylindrosporium ulmicolum, and it may be identical with Phleo- 
spora Ulmi (Fr.) Wallr., since the two descriptions appear very 
much alike. Septogloeum profusum has been reported as occurring 
on the leaves of Ulmus alata and U. americana, although it was 
originally described on Corylus americana. Two species of Gloeo- 
Sporium, or rather one species and a variety of the same, have 
been described on the elm in Europe. One of these, Gloeosporium 
inconspicuum Cav., was described on Ulmus americana in Italy, 
but has never been reported in this country. It was distributed 
by Briost and CAvara in “Funghi parassiti” as no. 350. It 
causes large ochraceous spots on the upper side of the leaf, and 
has very small bacteriform spores, only 1-2 win length. A variety 
of this species, Gloeosporium inconspicuum Cav. var. campestris 
Dor. (15), has been described on Ulmus campestris in Russia. 
From the description this is quite similar in external appearance 
to the preceding species, but the spores and conidiophores are 
considerably larger, the spores measuring 3—6 (sometimes 9) X 1-2 ». 
The fungus described as occurring on Ulmus americana and other 
species of elm in America in connection with Gnomonia ulmea does 
not agree in any particular with any of these, and therefore I pro- 
pose for it the name Gloeosporium ulmeum, with the following 
formal description. 
Gloeosporium ulmeum, sp. nov.—Acervuli somewhat gregari- 
ous, often confluent, borne on black stromata, usually over the 
base of the developing perithecium of Gnomonia ulmea, covered 
by the darkened cuticle, which later splits and cracks irregularly 
