52 ILUNOIS BIOLOGICAL MONOGRAPHS [520 



celium black, forming a very close network, 9/i in diameter, branches 

 mostly opposite. 



Capitate hyphopodia large, alternate, close, 1 per ceU, cells about 

 20/1 long, head cell pyriform, 24 x 17/i, the basal 7/x long. Mucronate 

 hyphopodia few, alternate or opposite, bottle-shaped, crooked, narrow, 

 16-18 X 6/1. Perithecial setae none. Mycelial setae few, straight or 

 slightly curved, 150 x 7/i, dark throughout, tip obtuse. 



Perithecia lOO-119/i, slightly rough, with conic projections. 



Asci soon evanescent; ascospores 4-septate, brown, very slightly 

 constricted, obtuse, 34 x 14/i. 

 On Mayepea domingensis Krug and Urb. 



Mayaguez Mesa, June 29, '15, 7556 (type). Maricao, Apr. 3, '13, 

 822. 



The distinctive characters of this species are close, dense, small 

 colony and thick capitate hjT)hopodia. The setae are sometimes very 

 scant and may perhaps be entirely wanting. ^Most leaves which bear 

 this fungus are infested with M. mayepeae also, but the two are readily 

 separable by the naked eye. 



75. I^Ieliola clusiae sp. nov. 



Colonies hypophyllous, irregular, diffuse, 3-5 mm. in diam. Mycelium 

 brown, 8/i thick, nearly straight, branching mostly opposite. 



Capitate hyphopodia alternate, 1 per cell, cells about 30/i long. 

 Head cell ovate to elliptical, more rarely cylinder or irregular, 20 x 14/i, 

 stalk cell 2-4/t long. Mucronate hyphopodia scattered, 20 x 7/i, bottle- 

 shaped. Perithecial setae none. Mycelial setae few, 800 x lO/i at base, 

 tips obtuse, brittle, usually broken, mostly clustered around the peri- 

 thecia. 



Perithecia apparently dimidiate, with an areola of radiating hyphae. 

 Spore 61 x 20/i, strongly constricted, obtuse, cylindrical. 

 On Clusia minor L. 



El Alto de la Bandera, July 15, 8571, July 15, '15, 8283 (type). 



Section F. 



Spores 4-septate, no perithecial setae or appendages, mycelial setae 

 simple, uncinate. There are only two species known in Porto Rico. 



Key To Species of Section F. 



Capitate hyphopodia crowded M. guareieola No. 76 



Capitate hyphopodia not crowded M. tecomae No. 77 



