ARTHUR: NEW SPECIES OF UREDINEAE—XV 55 
Many species having teliospores with more or less vertical septa 
have since been placed under the genus, but more recently all of 
these, including the original species, have usually been referred 
to the genus Puccinia. With the discovery of the subcuticular 
pycnia, and the consequent certainty that only pycnia and telia 
occur in the life cycle, all doubt of the validity of the genus is 
removed. In addition to the type species and the present one 
the following appear to me to be genuine members of the genus: 
D. Piptadeniae Dietel. on Piptadenia latifolia, D. Puiggarii 
Speg., on Cassia sp., and D. australe Speg., on Mimosa Roca, all 
three from South America. 
Puccinia Lygodii (Hariot) comb. nov. 
Uredo Lygodii Hariot, Jour. de Bot. 14: 117. 1900. 
be dI. Pycenia and aecia unkno 
Uredineae hypop hyllous, paces or somewhat gre 
ae he round, 0.3-0.5 mm. in diameter, at first sews becom- 
ing naked, pulvinate, moderately pulverulent, cinnam n, 
prominent, ruptured epidermis inconspicuous; scdiniospat 
ellipsoid or obovoid, 18-23 by 26-29u; wall pale cinnamon- 
brown, thin, 1.54, moderately vad evenly echinulate, the pores 
indistinct, probably 2 or 3, equatorial. 
II elia hypophyllous, ecattered, — or oe gi ’. vie 
mm. long, soon naked, pulvinate, cinn n-bro 
epidermis inconspicuous; teliospores ne ees ‘ellipsoid 
or obovoid, 19-23 by 24-29u, rounded above, rounded or some- 
what narrowed below, not mgr at septum, pale cinnamon- 
1.54 thick, thicker above, 3-74, smooth, the septum 
variously oblique; pedicel ploeios about length of spore. 
On Lygodium polymorphum (Cav.) H. B. K. (Schizaeaceae), 
near Bahia, Brazil, May 28, 1915, J. N. Rose & P. G. Russell 
21514. A collection of the host, made at the same place and 
date, bearing the number 19664a, now in the National Herba- 
rium, also shows an abundance of the rust. For a fragment 
from this sheet I am indebted to W. R. Maxon. This is the 
material poring! referred to by the writer as Desmella, in 
Bot. Gaz. 73: 62. January 1922. The superficial appearance 
of the ety is not unlike that of a Desmella, but by making 
sections it is easily seen that the sori are subepidermal, and 
wholly accord with those of the genus Dicaeoma, to which it may 
be referred as D. Lygodii (Hariot) comb. nov. This is the first 
