Pakt 5, 1920] AECIDIACEAE 341 
branched, septate, colorless, thin-walled hyphae, capitate, 16-19 by 32-48 uw, the wall light 
golden-brown, 2-3 » thick, smooth, the stalk often very short; urediniospores ellipsoid, 23-26 
by 23-37 4; wall cinnamon-brown, thick, 2.5-3 , rather sparsely and prominently echinulate, 
the pores 4 or 5, approximately equatorial. 
III. Telia hypophyllous, scattered, round, 0.3-0.5 mm. in diameter, early naked, chestnut- 
brown, ruptured epidermis conspicuous; teliospores oblong, 19-22 by 35-45 np, rounded above 
and below, constricted at septum; wall light chestnut-brown, or light-fuliginous, 1.5 « thick, 
slightly thickened above, 3 4, smooth; pedicel short, up to 26 u, colorless. 
On Poaceae: 
Phyllostachys aurea Riv., Florida. 
Phyllostachys sp. not aurea or bambusoides, Florida. 
Type LocaLity: Wahjain, Khasi Hills, India, on Arundinaria sp. 
DistRiBurion: In the Plant Introduction Garden at Brooksville, Florida; also in Asia. 
96. Dicaeoma ignavum (Arth.) Arthur & Fromme. 
Uredo ignava Arth. Bull. Torrey Club 46: 121. 1919. 
O and I. Pyenia and aecia unknown. 
II. Uredinia amphigenous, numerous, evenly scattered or loosely grouped, frequently in a 
linear series, on light-brown discolored areas, roundish or oblong, small, 0.2-0.6 mm. across, 
rather early naked, pulverulent, cianamon-brown, ruptured epidermis conspicuous; paraphyses 
encircling the sori, numerous, hyphoid, incurved, 10-13 by 29-45 y, the wall pale cinnamon- 
brown or sometimes colorless, 1-1.5 » thick, frequently thickened 3-5 » on the convex side; 
urediniospores obovoid or ellipsoid, 14-19 by 23-27 y; wall colorless or pale cinnamon-brown, 
1-2 w thick, moderately echinulate, the pores obscure, probably 4, equatorial. 
Hil. Telia unknown. 
On Poaceae: 
Bambos vulgaris Schrad., Cuba; Jamaica; Porto Rico. 
TYPE LocALIty: Santiago de las Vegas, Cuba, on Bambos vulgaris. 
DistRIBUTION: West Indies. 
97. Dicaeoma obtectum (Peck) Kuntze, Rev. Gen. 33: 469. 1898. 
Puccinia obtecta Peck, Bull. Buffalo Soc. Nat. Sci. 1:66. 1873. 
Aecidium compositarum Bidenlis Burrill; De-Toni, in Sacc. Syll, Fung. 7: 799. 1888. 
O. Pycnia amphigenous, gregarious, usually crowded in small groups about 0.5 mm. across, 
noticeable, projecting rather prominently above the surface of the leaf, honey-yellow becoming 
brownish, columnar or frustum-shaped, 80-100 » broad by 110-130 yw high. 
I. Aecia hypophyllous, gregarious, usually in annular groups 2-3 mm. across, cupulate, 
0.2-0.3 mm. in diameter; peridium rather delicate, recurved and erose at margin; peridial 
cells rhomboidal, 23-27 u long, somewhat overlapping, the outer wall rather thick, 5-7 yu, trans- 
versely striate, the inner wall thinner, 3-5 », verrucose; aeciospores globoid, 13-19 by 18-21 yw; 
wall colorless, thin, 1 4, very finely verrucose. 
On CARDUACEAE: 
Bidens connata Muhl., Wisconsin. . . 
Bidens frondosa L., Uinois, Nebraska, New Jersey, Wisconsin. : 
Bidens glaucescens Greene, Colorado, Kansas, Nebraska, New Mexico. 
II. Uredinia amphigenous, in small groups 2-3 mm. across or often solitary, lenticular, 
0.5-0.8 mm. or more long, ‘sometimes confluent, rather tardily naked, pulverulent, cinnamon- 
brown, ruptured epidermis conspicuous; urediniospores ellipsoid, 13-20 by 25-35 u; wall 
light cinnamon-brown, 1.5-2 » thick, moderately echinulate, the pores 2, equatorial. 
III. Telia amphigenous, usually in compact compound groups I-4 mm. across, surrounded 
by a brownish hyphal stroma, blackish-brown, long covered by the epidermis, usually noticeably 
raised above the leaf-surface; teliospores clavate or subcylindric, 16-23 by 58-64 nu, rounded, 
obtuse or narrowed above, usually narrowed below, slightly constricted at septum; wall chest- 
nut-brown, 1-24 thick, much thicker above, 5-12 4%, smooth; pedicel tinted, concolorous, 
short, about one half length of spore or less. 
On CYPERACEAE: : a : 
Scirpus americanus Pers. (S. pungens Vahl), California, Colorado, Idaho, Illinois, Indiana, 
Massachusetts, Montana, Missouri, Nebraska, New Jersey, New Mexico, New York, 
Oklahoma, Oregon, South Dakota, Wyoming. 
