1920] STEVENS— PORTO RICAN FUNGI 251 



This fungus is particularly interesting. To the naked eye it is like a rust. 

 Superficial microscopic examination shows circular conidial sori which on 

 casual observation might pass as a Cylindrosporium. Intermingled with 

 the circular sori are many linear sori and stromata, all bearing the Septoria- 

 like conidia in great numbers. Microtome sections show that all development 

 is subepidermal. The first locule is conidiiferous, and is so thin-walled that 

 the wall might easily be overlooked. The sorus elongates, ruptures the 

 epidermis, and in section takes on the appearance shown in text fig. 3. At 

 about this period perithecial locules appear with asci and spores. Their 

 walls are indistinguishable from the surrounding stroma, and the whole struc- 

 ture is truly Dothideaceous. The stromata are frequently overgrown by a 

 Helminthosporium. Following Theissen and Sydow, it belongs to the Dothide- 

 aceae, falling in the genus Dothidella. To many it may appear more reason- 

 able to put it in the Hypocreales on account of its color; but it appears to me 

 to show much closer relationship with the Dothideaceae, notwithstanding 

 its pale color. 



PH YLL A CHORA CE AE 



Trabutia Randiae (Rehm.) Th. and Syd. 



On Randia aculeala, Cabo Rojo, 6455. 



This fungus is clearly a Trabutia with strictly subcuticular stroma, and 

 as it agrees well with the published description of T. Randiae, it is in ail proba- 

 bility that species. 



SCIRRHIINEAE " 



Catacauma Ocoteae, sp. nov. — Spots irregularly circular, 

 0.5-1 cm. or more in diameter, visible from above or below on 

 dead, tan-colored tissue, border indefinite. Stromata circular, 

 numerous, scattered throughout the spot, plane above, strongly 

 rounded below. 



1-1 . s mm 



mesophyll. Clypeus hypophyllous, rarely epiphy 

 extending slightly beyond the perithecia, very thick (oo-no/x). 



Locules several, large (about 300 /z in diameter), irregular. Asci 

 4-8-spored, 85-102 X 7 fx long, slender, with long sterile base. Spore 

 1 -celled, hyaline, oblong, 14-20X3 . 5 p. Paraphyses filiform. 



On Ocotea leucoxylon, Monte Alegrillo, 4725 (type), 732, 1347. 

 Entirely distinct from Phyllachora ocoteicola, although often upon the 

 same leaf. 



Catacauma palmicola, sp. nov. (figs. 10-12).— Stromata con- 

 spicuous above, few below, black, shining, oval, 1-6 X 1-3 mm., 



