Arthur: Uredinales of Porto Rico 
179 
14. Argomyces insulanus sp. nov. 
Pycnia epiphyllous, subepidermal, few in crowded groups, 
globoid-flask-shaped, 105-175 by 1 70-200 jn. 
Aecia uredinoid (primary uredo), hypophyllous, few surround- 
ing the pycnia, sometimes confluent ; aeciospores somewhat larger 
than the urediniospores. Otherwise same as the uredinia. 
Uredinia hypophyllous, few, scattered, round or oblong, small, 
0.3-0.5 mm. long, early naked, pulverulent, dull cinnamon-brown, 
ruptured epidermis evident ; urediniospores ellipsoid or obovoid, 
19-26 by 26-35 i wall cinnamon-brown, moderately echinulate, 
1. 5-2. 5 /X thick, the pores usually three, equatorial or slightly sub- 
equatorial, indistinct. 
Telia hypophyllous, few, usually scattered, round to oblong, 
o. 3-0.8 mm. long, early naked, dull cinnamon-brown, germinat- . 
ing at maturity, ruptured epidermis evident ; teliospores broadly 
ellipsoid to ellipsoid-fusiform, 19-30 by 42-60 /x, obtuse, or some- 
what attenuated at both ends, slightly constricted at septum ; wall 
pale cinnamon-brown, thin, 1-1.5/x, with a low hyaline papilla 
over the pore, disappearing at germination, smooth, the pore in 
lower cell near the septum ; pedicel slender, colorless, once length 
of spore or less. 
On Carduaceae: 
Vernonia albicaulis Pers., River junction below Utuado, 
Dec. 30, O, II, III, djpd (type), O, II, III, 6j8p. 
Vernonia longifolia Pers., Villa Alba, Jan. 3, III, //j. 
This species differs from Arg. V ernoniae by the broad and 
much larger teliospores. It is notably distinct from Puccinia 
Becki Mayor and P. V ernoniae-mollis Mayor, both from Colom- 
bia, S. A., the former having very long, slender teliospores, and- 
the latter very small teliospores. 
Arg. insulaniis also occurs on the island of St. Croix. It was 
collected by A. E. Ricksecker in 1896, and recorded by Ellis & 
Kelsey (Bull. Torrey Club 24: 208. 1897), under the name of 
Puccinia Vernoniae Cooke. The determination was considered 
doubtful at the time. Although the type of P. Vernoniae, which 
is African, has not been seen, yet there is slight chance of the 
West Indian and African forms being the same. Another repre- 
sentative of the St. Croix rust has been communicated by Mr. 
Percy Wilson, who found it on a phanerogamic specimen col- 
lected in St. Croix, Jan. 17, 1896, on V. albicaulis, by Marion 
