144 



Mycologia 



Zexmenia sp., Road to Fraijanes on Volcan de Poas, Jan. 6, 1916, 

 II, HI, 377. 



Pycnia epiphyllous, few, gregarious, noticeable, subepidermal, 

 orange becoming brownish, globose or flask-shaped, 50-65 fx broad 

 by 50-80 high. 



Uredinia (primary) epiphyllous, crowded on slightly raised 

 spots surrounding the pycnia, or (secondary) chiefly hypophyl- 

 lous, scattered, round, small, 0.2-0.4 mm. in diameter, early 

 naked, pulverulent, cinnamon-brown, ruptured epidermis, con- 

 spicuous ; urediniospores obovoid or broadly ellipsoid, 16-19 by 

 20-24//,; wall colorless or light golden-yellow, finely and 



moderately echinulate, the pores 2, equatorial. 



Telia chiefly hypophyllous, scattered, round, small, 0.2-0.4 mm. 

 in diameter, early naked, pulvinate, chocolate-brown, becoming 

 cinereous by germination, ruptured epidermis conspicuous ; telio- 

 spores ellipsoid or obovate, 16-20 by 26-34 /x, rounded above, 

 rounded or narrowed below, not or slightly constricted at septum ; 

 wall (in resting form) chocolate-brown, 2-3 p, thick, thicker above 

 by a broad lighter colored umbo, 3-7 \x, uniformly and finely ver- 

 rucose, or (in germinating form) cinnamon- or light chestnut- 

 brown, 1-2 fx thick, obscurely verrucose above and smooth below ; 

 pedicel colorless, once to once and a half length of spore, often 

 deciduous. 



The species is a long-cycle one without aecia, and is well marked 

 and especially characteristic in having teliospores that are dark 

 and thick walled in some sori and light and thinner walled in 

 others, the former being in resting condition and the latter ger- 

 minating like a leptoform. 



1 01. Puccinia absicca Jackson & Holway sp. nov. (on 

 Carduaceae) 



Zexmenia frutescens villosa (Polak) Blake, San Jose, Dec. 10, 

 1915, O, III, 239. 



Pycnia epiphyllous, few, gregarious, yellowish or light orange, 

 conspicuous, subepidermal, globoid, 30-50 /x broad. 



Telia epiphyllous, numerous in crowded, orbicular groups sur- 

 rounding the pycnia, or in elongated groups on the veins, roundish, 

 0;5-o.8 mm. across, somewhat tardily naked, pulverulent, chest- 

 hut-brown, surrounding epidermis conspicuous ; teliospores ellip- 

 soid, 20-24 by 28-34 fx, rounded at both ends, not or slightly con- 

 stricted at the septum ; wall cinnamon- to chestnut-brown, 2-2.5 fx 

 thick, thicker above, 5-7 ft, moderately verrucose-rugose, often 



