Part 5, 1920] AECIDIACEAE 387 
the margin erect, lacerate; peridial cells rhomboidal, 14-18 by 22-28 y, overlapping, the outer 
wall 5-9 » thick, transversely striate, the inner wall thin, 2-3 u, coarsely verrucose; aecio- 
spores globoid or ellipsoid, 12-17 by 17-21 yu; wall pale-yellow, thin, 1 4, minutely verrucose. 
II. Uredinia epiphyllous, few, scattered, oval or roundish, small, 0.1-0.4 by 0.1-0.6 mm., 
early naked, pulverulent, yellowish-brown, ruptured epidermis noticeable; urediniospores 
ellipsoid or globoid, 16-19 by 19-23 u; wall golden- or cinnamon-brown, 1-2» thick, finely 
verrucose, the pores 3 or 4, equatorial. 
; III. Telia epiphyllous, numerous, scattered or loosely confluent, roundish or irregular, 
0.2-0.6 by 0.2-1 mm., early naked, somewhat pulverulent, blackish-brown, ruptured epidermis 
conspicuous; teliospores ellipsoid, 19-24 by 29-39 yw, rounded at both ends, usually constricted 
at septum; wall chestnut-brown, 1.5-2.5 uv thick, thicker above, 5—9 wu, smooth; pedicel slightly 
colored near the spore, two to three times length of spore, narrowed and roughened over its 
lower portion. 
On AMARANTHACEAE: 
Brayulinea densa (Willd.) Small (Guilleminea illecebroides H.B.K., G. densa Mogq.), Jalisco, 
Hidalgo, Mexico (state). 
Type LocaLiry: Near City of Mexico, Mexico, on Guilleminea ‘densa]. 
DISTRIBUTION: Southern Mexico. 
ILLUSTRATIONS: Holway, N. Am. Ured. 1: pl. 14, f. 57a, b. 
Exstccati: Barth. N. Am. Ured. 1246; Sydow, Ured. 1874. 
173. Diaceoma striolatum (Speg.) Arthur. 
Uredo striolata Speg. Anal. Soc. Ci. Argent. 9: 173, 1880. 
Puccinia macropoda Speg. Anal. Soc. Ci. Argent. 10:8. 1880. 
Puccinia striolata Arth. Mem. Torrey Club 17: 142. 1918. 
O and I. Pyenia and aecia unknown. 
II. Uredinia amphigenous, scattered or crowded upon discolored areas, 1-2 mm. in diam- 
eter, round or oblong, 0.2-0.5 mm. long, early naked, pulverulent, cinnamon-brown, rup- 
tured epidermis conspicuous; urediniospores ellipsoid, obovoid or globoid, 18-24 by 24-32 yu; 
wall cinnamon-brown, 2—3 u thick, obliquely and irregularly rugose, the pores 2~4, equatorial 
or with some of the pores stperequatorial. 
III. Telia amphigenous but chiefly epiphyllous, grouped or scattered, closely associated 
with the uredinia, round or oblong, 0.5-1 mm. long, early naked, compact, chocolate-brown, 
ruptured epidermis conspicuous; teliospores ellipsoid or oblong-ellipsoid, 24-31 by 39-51 n, 
rounded at both ends, slightly constricted at septum; wall chestnut-brown, thick, 4-5 yz, 
thickened at apex up to 104, smooth; pedicel colorless, 7 u in diameter, about twice length 
of spore. 
On AMARANTHACEAE: 
Tresine angustifolia Euphr. (I. elatior Rich.), Cuba; Porto Rico; St. Thomas. 
Iresine Celosia L. (I. paniculata Kuntze), Cuba. 
Type LOCALITY: Boca del Riachuelo, Argentina, on Iresine celosioides. 
DistRIBUTION: West Indies; also in South America. 
I_nLusrrations: Holway, N. Am. Ured. 1: pl. 14, f. 58a, b. 
174. Dicaeoma (?) obesisporum Arthur. 
Puccinia obesispora Arthur, Bull. Torrey Club 45: 147. 1918. 
O and I. Pycnia and aecia unknown. 
II. Uredinia chiefly hypophyllous, scattered, or confluent on brownish spots, often ar- 
ranged in circles, round, oval or crescent-shaped, rather small, 0.1-0.6 mm. in diameter, early 
naked by irregular breaking of the epidermis, pulverulent, cinnamon-brown, ruptured epi- 
dermis prominent; urediniospores broadly ellipsoid or globoid, 19-26 by 24-30»; wall dark 
golden- or cinnamon-brown, variable in thickness, 1.5-3 u, rather sparsely and strongly echinu- 
late, the pores 2, equatorial. 
III. Telia chiefly hypophyllous, scattered, or confluent on brownish spots, round or ir- 
regular, 0.1-0.5 mm. in diameter, rather early naked, dark chocolate-brown, ruptured epi- 
dermis evident; teliospores ellipsoid, 26-35 by 55-70 u, rounded, obtuse or acute above, rounded 
below, slightly or not constricted at septum; wall chocolate-brown, thick, 3-4 «, thicker at 
apex, 6-12 yu, coarsely and rather sparsely verrucose; pedicel colorless except near the spore, 
twice length of spore or less. 
