“Part 2, 1907] AECIDIACEAE 147 
flattened on the underside of the head, reaching from the periphery to the pedicel, united 
laterally ; pedicel colorless, short, deciduous. 
On MrmosaceaE: 
a Leucaena lanceolata S. Wats., Mexico. 
YPE LOCALITY : Mexico, on ‘‘Lecania,” error for ZL 
DISTRIBUTION : Known only from the type locality. Ce ae 
ILLUSTRATIONS: Hedwigia 33: bl. 3, f. 12; Bot. Gaz. 35: pl. 2, f. 9. 
5. DICHEIRINIA Arthur, gen. nov. 
Pycnia and aecia unknown, the latter possibly wanting. 
; Uredinia encircled by paraphyses, subepidermal. Urediniospores borne singly on ped- 
icels, echinulate, 
Telia subepidermal. Teliospores free, more than one on each pedicel, I-celled; pore 
one, terminal. 
Type species, Triphragmium binatum Berk. (on unknown plant). 
1. Dicheirinia binata (Berk.) Arthur. 
‘Triphragmium binatum Berk. Proc. Am. Acad. 4: 125. 1858. 
O and I. Pycnia and aecia unknown or wanting. 
II. Uredinia hypophyllous, subepidermal, scattered, minute, round, 0.1-0.2 mm. 
across, soon naked, pulverulent, pale cinnamon-brown, ruptured epidermis inconspicuous; 
paraphyses abundant, peripheral, clavate or capitate, 13-23 » broad above, about 50 long, 
wall smooth, thin, colorless; urediniospores broadly obovate or globoid, 19-26 by 25-29 n, 
wali golden-yellow, thick, 3-4, sparsely and sharply echinulate, pores 3 (?), equatorial. 
III. Telia hypophyllous, like the uredinia, but slightly darker-colored; teliospores 
paired, one slightly higher on pedicel than the other, broadly obovate, 26-29 by 35-404, 
flattened or rounded above, narrowed toward base; wall cinnamon-brown, medium thick, 
at sides 2-34, covered above with finger-like projections, more or less branched, up to 124 
long ; pedicel slender, persistent, slightly colored, as long as the spore. 
On unknown plant [MIMosACEaAs ?}. 
TYPE LOCALITY: Nicaragua, on unknown plant. 
DISTRIBUTION: Known only from the type locality. 
6. PILEOLARIA Cast. Obs. 1: 22. 1842. 
Cycle of development includes pycnia, uredinia and telia, with more or less evident 
alternating phases. Pycnia subcuticular, other sori subepidermal. 
Pycnia depressed-conical or hemispherical; hymenium flat; ostiolar filaments wanting. 
Uredinia erumpent, definite, without peridium or paraphyses. Urediniospores borne 
singly on pedicels, oblong-fusiform; wall colored, usually paler below, verrucose; pores 
more or less equatorial. ‘ 
Telia erumpent, definite. Teliospores borne singly on pedicels, one-celled, flattened 
above and below; wall colored, verrucose. 
Type species, Pileolaria Terebinthi Cast. (on Pistacia Ti erebinthus). 
Mia eal Por ilacer he evel Pa - evident spiral rows. 1. P. Toxicodendri. 
Urediniospores with tubercles in evident longitudinal rows, not crowded. 2. P. extensa. 
Urediniospores with tubercles in obscure longitudinal rows, crowded. 3. P. patzcuarensis, 
Urediniospores with wall not thickened above, tubercles in longitudinal rows. 4. P. mexicana. 
1. Pileolaria Toxicodendri (Berk. & Rav.) Arthur. 
Uromyces Toxiodendri Berk. & Rav. Grevillea 3: 56. 1874. ‘ 
Pilotaria brevipes Berk. & Ray. Grevillea 3: 58,1874. 
Uromyces punctato-stviatum Cooke & Hark. Grevillea 14: 8. 1885. 
Uromyces brevipes Holway, Bot. Gaz. 24: 24. 1897. . 
O. Pycnia amphigenous, greater number epiphyllous, in rather large groups, crowded, 
large, papillose, honey-yellow becoming blackish, subcuticular, flattened-hemispherical, 
i 
60-1102 broad, 30-60 high. 
