134 



Mycologia 



The species is especially characterized by flattened urediniospores 

 and by exceedingly large and inflated pedicels to the telio- 

 spores. The type was collected by Professor Holway in Guate- 

 mala on Lippia myriocephala Schl. & Cham., on the road be- 

 tween Quezaltenango and Colomba, Feb. 4, 191 7, O, ii, III, 831. 

 The host of the Costa Rican collection resembles L. umbeilata 

 Cav. 



67. Puccinia Urbaniana P. Henn. (on Verbenaceae) 

 Valerianodes cayennensis (Vahl) Kuntze (Stachytarpheta 



cayennensis Vahl), Orotina, Dec. 31, 1915, 335. 

 A short-cycle rust, very common in tropical America on many 

 hosts. 



68. Puccinia permagna Arthur & Holway sp. nov. (on 



Verbenaceae) 



Lippia myriocephala Schl. & Cham., San Jose, Jan. to, 1916, 

 404. 



Pycnia epiphyllous, loosely grouped on yellowish spots 0.4-1.5 

 mm. across, noticeable, blackish-brown, subepidermal, conoidal, 

 1 12-128//, broad, 5 5-80 /x high; ostiolar filaments wanting. 



Telia mostly hypophyllous, numerous, single or crowded 

 into irregular groups, roundish, large, 1-2.5 mm - across, some- 

 what pulvinate, cinnamon-brown, ruptured epidermis inconspicu- 

 ous ; teliospores broadly ellipsoid, 24-27 by 35-42 ^, rounded at 

 both ends, slightly constricted at septum; wall cinnamon-brown, 

 thin, 1 ix, thicker above and over pore near septum, 3-6 /x, form- 

 ing a hyaline umbo, smooth ; pedicel very large and inflated, 20- 

 25 /x in diameter, often somewhat fusiform, four to five times 

 length of spore, the wall colorless, thin, 1 /x, usually thickened 

 next the spore. 



The species has a general resemblance to P. elatipes Arth. & 

 Holw., which occurs on the same host in Guatemala, but is with- 

 out uredinia. The pycnia are remarkably numerous and con- 

 spicuous, being much darker than in P. elatipes. The telial sori 

 are also larger than in that species, as are the teliospores and 

 especially their pedicels. 



The fungus was found only on fresh shoots coming up from 

 stumps of the shrubs cut to make the trail. The growth was very 



