46 ILLINOIS BIOLOGICAL MONOGRAPHS [514 



celium forming a loose network of straight, radiating threads, 8/* thick, 

 branches mostly opposite. 



Capitate hyphopodia alternate, often at right angles to mycelium, 

 not crowded, 1 per cell, cells about 34/i long, head cell ovate, 17 x 14/t, 

 stalk cell short. Mucronate hyphopodia usually opposite, bottle-shaped, 

 neck narrow. Perithecial setae none. Mycelial setae abundant, straight, 

 simple, black throughout, rigid, abruptly acute, 275-500 x 8-9/i. 



Perithecia 150-160)u,. Asci evanescent, spores 37-40 x 14-15/t, 4- 

 septate, constricted, obtuse. 

 On Paiillinia pinnata L. 



Mayaguez, May 3, '13, 1149 (type), Oct. 31, '13, 3956, 3914, 3967&. 

 Vega Baja, Feb. 22, '13, 376. El Alto de la Bandera, July 16, '15, 8722. 

 Rio Arecibo, K. 64.7, July 8, '15, 7787. Barros, Jan. 2, '13, 55. 

 On Casearia ramiflora Vahl. 



Martin Pena, Aug. 11, '15, 9306, 9328. Barceloneta, Aug. 10, '15, 

 9256. Manati, July 2, '15, 7688. Vega Baja, March 1, '13, 512, July 2, 

 '15, 7745, Nov. 5, '13, 4262, March 2, '13, 510. St. Ana, Dec. 31, '13, 

 6683. San German, Dec. 12, 13, 5844. 



On Casearia sylvestris Sw. 



Mayaguez Mesa, June 29, '15, 7566, June 14, '15, 7017, May 1, '13, 

 1051, May 4, '13, 1200. Miradero, Aug. 4, '15, 9136. Arecibo-Lares 

 Road, June 21, '15, 7285. San German, Dec. 12, '13, 5837, 5864. 

 On Casearia arhorea (L. CI. Rich.) Urb. 



Monte de Oro, Dec. 13, '13, 5709. 

 On Casearia aculeata Jacq. 



Lajas, June 17, '15, 7151. 

 On Casearia sp. 



Dos Bocas, below Utuado, Dec. '17, '15, 6071. Mayaguez, June 15, 

 '15, 7074, Oct. 31, '13, 3935. 3920. 



The specimens on Casearia differ somew^hat from those on Paul- 

 linia, especially in the character of the setae. 

 On Mammea americana L. 



Maricao, Sept. 20, '13, 3641. Las Marias, July 10, '15, 8207. 

 On host unknown, Martin Pena, Aug. 11, '15. 



The specimens upon Mammea show distinctly longer and more 

 slender setae than those on other hosts and are perhaps specifically dis- 

 tinct. 



According to the keys of Gaillard this species would be identified 

 as M. polytricha, K. and C, therefore, for purposes of comparison, I am 

 publishing a photograph of the type of M. polytricha, fig. 44. 



