iqiq] TEHON— PORTO RICAN FUNGI 509 



white or ashy at maturity, o . 5-2 mm. in diameter, crowded on the 

 stroma, circular or elongate, and rupturing irregularly. Conidia 

 elliptic or slightly falcate, 14-18X4-5 ju, 4-septate, slightly con- 

 stricted; central cells fuscous, end cells hyaline, the apical cell conic, 

 ornamented by 2 widely divergent, hyaline, fihform setae 7-10 /x 

 long, basal cell prolonged into a single hyaline seta 3-5 n in length. 



On leaves of Lucuma muUiflora A. DC, Monte Alegrillo, July 20, 1913, 

 no. 2301 (type). 



It was a surprise to find this specimen a Pestalozzia. Its superficial 

 characters suggest strongly a Phacidiaceous form, but a close examination 

 reveals the fact that instead of an ascoma, the fruiting body is an acervulus. 

 The acervuh are grouped closely on a large stroma which causes a characteristic 

 black spot on the leaf. 



Helminthosporium Link 



Helminthosporium folliculatum Corda var. brevipilum 

 Corda, Icon. 2:13, 1838. 



On Paspalum conjugaliim Bergius, Tanama River, July 6, 1915. 



AcROTHECiUM Prcuss. 

 Acrothecium flacatum, sp. nov. — Mycelium light olivaceous, 

 septate, 2 . 5 ju in diameter, attacking the spikelets and thickly 

 covering the glumes and awns of the flowering heads. Conidio- 

 phores dark olivaceous in color, straight, somewhat bulbous at 

 the base, 96-125 X 5 /x. Spores olivaceous, luniform, 3 or 4-septate, 

 borne apically on the conidiophores in fascicles of 3-5, 35X10JU; 

 central cell very much enlarged, dark, and not equilateral; the 

 terminal cells small and nearly hyaline. 



On Setaria species, Porto Rico, 191 5, no. 9181 (type) (fig. la, b, c). 



Another fungus belonging to this genus and possessing the same strikingly 

 characteristic spore is generally reported as the cause of the "ringspot" of 

 sugar cane. It was first mentioned by Breda de Haan in 1892, and was 

 thought by him to be the conidial stage of Leptosphaeria sacchari. In 1898 a 

 fungus identical with that of Breda de Haan's was described by Wakker^ 

 on dead leaves of sugar cane under the name of Acrothecium lunatum. 



The present species, however, is clearly distinct from that described by 

 Wakker, in that the conidia are more frequently 4-septate than 3-septate, 

 distinctly larger, and regularly borne in fascicles of 3-5 on the tips of the 



■t Wakker, J. H., and Went, F. A. F. C, De Ziekten van het Suikerriet op Java, 

 pp. 149, 196. Leiden. 1898. 



