24 Journal oj Mycology [Vol. 13 



I. Aiecia hypophyllous, gregarious, numerous on indefinite 

 discolored spots, 0.5-1.5 cm. across, especially extending along the 

 veins, short, 0.2-0.3 mm. in diameter ; peridium white, margin 

 erect, slightly erose, peridial cells rhomboidal, 15-25/^ long, some- 

 what overlapping, walls of equal thickness 2-4/^, inner moderately 

 verrucose, outer smooth, transversely striate ; aeciospores globoid. 

 16-18 X 18-231U,, wall colorless, thin, about ijx, finely and incon- 

 spicuously verrucose. 



On HcUotropinm indicum L (host no. 4372), Gualan, Depart. 

 Zacapa, alt. 122 m.. Mar. 12, 1905, no. 4326. 



The specimens from which this species is described are a 

 part of the same collection from which Puccinia Hcliotropii sp. 

 nov. is described in this paper. In gross appearance and habit of 

 growth this species differs from Aecidium Heliotropii Tr. & Gal. 

 zndAccidkim bi forme Peck. It may possibly be identical with 

 Aecidium heliotropidatum Schw. of which no specimens have 

 been examined. The description, however, indicates a distinct 

 difiference in the distribution on the leaf surface and in the man- 

 ner of development in the groups. 



36. AECIDIUM BYRSONIMAE Kern & Kellerm. sp. nov. 



0. Pycnia amphigenous and caulicolous, preceding or 

 among the aecia, numerous, evenly scattered over the hj'pertro- 

 phied leaves and branches, conspicuous, subcuticular, becoming 

 chestnut-brown, conical, large, 1 50-200^11 broad, by 75-851U, high; 

 ostiolar filaments wanting. 



1. Aecia amphigenous and caulicolous, from an unlimited 

 mycelium causing extensive hypertrophy, numerous, scattered 

 often crowded, cylindrical, long, deep-seated, 0.5-0.7 mm. in diam. 

 by 1-1.5 mm. high; peridium white, margin erose, somewhat re- 

 curved, often deeply torn, peridial cells rhomboidal, overlapping 

 35-50/1 long, outer wall 3-4^^ thick, smooth, inner wall 5-7/i. thick, 

 coarsely verrucose. transversely striate ; aeciospores angularly 

 oval or oblong, often truncate at base, and narrowed above, 

 26-35X 39-57/Jt. wall pale yellow, coarsely verrucose, thick (3-5/t) 

 much thicker above (5-15/x,). 



On Byrsoniina crassifoUa (L.) H. B. K. (host no. 4368), 

 Sierra de las Minas, Depart. Baja Verapaz, alt. 615 m., Mar 

 10, 1905. no. 4325. 



An interesting species because of the hypertrophy it produces. 

 the prominent subcuticular pycnia, and the long and numerous 

 aecia, but especially on account of the very odd spores, which are 



