Gasman: Porto Rican Parasitic Fungi 337 
The species is referred to the genus Dimerium and differs from 
the usual form occurring in D. grammodes in the possession of a 
compact, radiate mycelium on the surface of the leaf. The 
species D. melioloides has been placed in the genus Parodiella 
by Rabenhorst and Winter, and distributed in their exsiccati 
under that name, but there is some uncertainty as to its real posi- 
tion as shown by the location originally given it by Saccardo.® 
The majority of the material at hand possesses spores that are 
only feebly colored, together with a few dark spores, but the large 
amount of material examined would seem to indicate that the 
dark spores occur only occasionally. 
4. Dimerium Stevensii sp. nov. 
Spots irregular in outline, one to several mm. in diameter ; 
perithecia sperical, black, shining, 100 in diameter; asci clavate, 
42-50 X 20-22 fju ; spores slightly greenish-hyaline, sometimes 
dark, two-celled, 16-20 X 6-8 ju; paraphases abundant. 
On leaves of Cordia corymbosa (L.) G. Don. Quebradillos, 
“ College Grounds,” Mayaguez, (typ^) '> Maricao 4816. 
Dimerina Thiessen 
I. Dimerina Jacquiniae sp. nov. 
Spots small, 0.25 p. in diameter, composed of a number of 
black, spherical perithecia, usually about 10; mycelium scant, 
loose, slightly reddish ; perithecia black, 48-60 p. in diameter ; 
asci hyaline, ovate, 26.4 X 12 /x; spores slender and hyaline, 
144-17 X 3-6 /X. 
On leaves of Jacquinia barhasco (Loefl.) Mez. Mona Island, 
6o8y (type). 
Phyllachora Nitschke 
i. Phyllachora peribebuyenis Speg. Rev. Myc. 9: 95. 
1887 
On leaves of the Melastomataceae, especially Miconia prasina 
DC., M. laevigata DC., M. Sintensii Cogn., Heterotrichum cynto- 
sum Urb., and a species of Tetrazygia: in Porto Rico: Maricao, 
Consume, Las Marias, 166, 741, 840, 1355a, 4708; Miconia laevi- 
3 Saccardo : Sylloge Fungorum i: 276. 
