Part 5, 1920] AECIDIACEAE 391 
181. Dicaeoma Ormosiae Arthur. 
Puccinia Ormosiae Arth. Mycologia 9:78. 1917. 
O and I. Pyenia and aecia unknown. 
II. Uredinia hypophyllous, scattered or somewhat grouped, round, 0.1-0.5 mm. in diam- 
eter, early naked, whitish or chocolate-brown, ruptured epidermis inconspicuous; paraphyses 
encircling the sorus, branched from near the base, expanding into a large, irregular, botryoid 
head, nearly colorless, becoming fugacious when old; urediniospores irregularly obovoid, 
20-26 by 24-32 u; wall chestnut-brown, about 1.5 » thick, sparsely echinulate with prominent 
slender echinulations, only one pore, basal, rather obscure. 
III. Telia not seen; teliospores in the uredinia, ellipsoid, 23-28 by 29-35 u, rounded at 
both ends, moderately constricted at septum; wall chestnut-brown, uniformly about 1.5 4 thick, 
exclusive of the closely set, large, bead-like warts measuring 2.5-3.5 » in diameter; pedicel 
fragile, breaking away close to the spore. 
On FaBacEak: 
Ormosia Krugit Urban, Porto Rico. 
TYPE Locality: El] Yunque, Porto Rico, on Ormosia Krugii. 
DISTRIBUTION: Porto Rico. 
182. Dicaeoma Oxalidis (Lév.) Kuntze, Rev. Gen. 
37: 469. 1898. 
Uredo Oxalidis Lév. Ann. Sci. Nat. II. 16: 240. 1841. 
Uredo Oxalidearum Cooke, Grevillea 10: 123. 1882. 
Puccinia Oxalidis Dietel & Ellis; Dietel, Hedwigia 34: 291. 1895. 
Aeccidium eral Maubl. Bull. Soc. Myc. Fr. 20:73. 1904. Not A. mexicanum Dietel & Hol- 
way, : 
Aecidium Maublancii Sydow, Monog. Ured. 2: 351. 1904. 
Argomyces (?) Oxalidis Arth. N. Am. Flora 7: 217. 1912. 
O. Pyenia epiphyllous, loosely gregarious in groups 1-3 mm. in diameter, conspicuous, 
deep-seated, chocolate-brown, ellipsoid-oblong, 110-125 u wide by 185-225 w high; ostiolar 
filaments short, not projecting beyond the ostiole. 
I. Aecia hypophyllous, crowded in groups 3-7 mm. in diameter, cornutiform, narrowed 
above, acute at the apex, 0.2 mm. in diameter, 1~2 mm. high; peridium white, long closed, 
often breaking off and falling out of the host-tissue; peridial cells square or rhombic, 18-23 by 
20-26 wu, abutted or slightly overlapping, the outer wall 9-12 » thick, transversely striate, the 
inner wall 1.5-3 », closely and finely verrucose; aeciospores angularly globoid or ellipsoid, 
11-15 by 13-18 4; wall colorless, 1-2 » thick, closely and finely verrucose, appearing smooth 
when wet. 
On BERBERIDACEAE: 
Mahonia Aquifolium (Pursh) Nutt. (Berberis Aquifolium Pursh, B. repens Lindl., B. nana 
Greene, Odostemon Aquifolium Rydb.), New Mexico. 
Mahonia Swaseyi (Buckl.) Fedde (Berberis trifolia Schultes, Odostemon Swaseyi A Heller), 
Mexico (state). 
IL. Uredinia hypophyllous, in orbicular or irregular groups 2-5 mm. across, often covering 
the whole surface, round, 0.3 mm. across or less, somewhat confluent, soon naked, pale yellow- 
ish-white, at first waxy, becoming pulverulent, ruptured epidermis rather inconspicuous; 
urediniospores globoid or elliptic-globoid, 16-19 by 17-24 »; wall very pale-yellow, very thin, 
0.8-1 yw, minutely echinulate, the pores uncertain. 
III. Telia hypophyllous, in orbicular or irregular groups 2-5 mm. across, often covering 
the whole surface, round, 0.3 mm. across or less, somewhat confluent, soon naked, very pale 
brownish-yellow, waxy, ruptured epidermis inconspicuous; teliospores ellipsoid or broadly 
oblong, 13-20 by 18-28 », rounded or obtuse at both ends, slightly or not constricted at septum; 
wall nearly or quite colorless, smooth, uniformly thin, 0.5-0.8 »; pedicel colorless, thick, very 
short. 
ON OXALIDACEAE: . 
Ionoxalis divaricata Small, Mexico (state). ; 
Ionoxalis latifolia (H.B.K.) Rose (Oxalis latifolia H.B.K.), Mexico. 
lonoxalis Martiana (Zucc.) Small (Oxelis Martiana Zucc.), Jamaica. 
Ionoxalis tetraneuris Small, Mexico (state). 
Ionoxalis trinervis Small, Mexico (state). 
Tonoxalis vallicola Rose, Mexico (state). 
