Part 3, 1912] ABCIDIACEAE 



383 



subcuticular extending into the epidermal cells beneath, hemispherical or discoid, 140-225 (i 

 broad by 80-100 /^ high ; pycniospores abundant, oval, about 3 /t^ long. 



II. Uredinia chiefly hypophyllous, at first on firm hemispherical or spherical excres- 

 cences 3-20 mm. across, on both leaves and stems, afterward scattered without hypertrophy 

 on under surface of the blades, pulvinate, soon naked, pulverulent, bright orange-yellow 

 fading to pale-yellow, sometimes confluent, ruptured epidermis noticeable ; urediniospores 

 ellipsoid or obovate-oblong, 16-26 by 19^0 // ; wall pale-yellow, 1.5-2. 5 ^ thick, thicker 

 above, 3-5 fi, echinulate-verrucose with rather fine tubercles closely set in spiral rows 2-3 fx 

 apart, the pores obscure. 



III. Telia chiefly hypophyllous, scattered, small, 0.1-0.2 mm. across, soon naked, 

 pulverulent, becoming pale-yellow or whitish, ruptured epidermis not noticeable ; telio- 

 spores narrowly obovate or oblong, 16-19 by 42-48 /i, usually germinating upon maturity; 

 wall nearly or quite coloriess, 1-1. 5 /i thick, thicker above, 3-5 /i, smooth. 



pN ROSACEAE : 



I?tidussp.y Guatemala. 

 Type locality : Jalambohoch, Guatemala, on J?ubus sp 

 Distribution : Central America ; also in South America. 



2. Spirechina Arthur! (Sydow) Arthur. 



Uromyces Arthuri Sydow, Monog. Ured. 2 : 203. 1910. 

 O. Pycnia not seen. 



II. Uredinia not seen ; urediniospores few, remaining in the telia, ellipsoid, 16-19 by 

 26-30// ; wall pale-yellow, thin, 1-1.5 //, marked with finely serrate winged appendages about 

 1-1.5 II high, set about 2-3 ii apart and running spirally around the spore, the pores obscure. 



III. Telia hypophyllous, scattered, small, roundish, 0.1-0.3 mm. across, soon naked, 

 becoming pale-yellow or whitish, pulverulent, ruptured epidermis not noticeable ; telio- 

 spores oblong, spatulate or sometimes triangular, 18-25 by 33^0 //, coronate at apex, usu- 

 ally narrowed below; wall nearly or quite colorless, thin, 1 //, thicker at apex which is set 

 with two to several large roundish projections, each 4-7 /^ wide by 4-9 M long, smooth ; 

 pedicel short, deciduous. 



On Rosaceae : 



Rubus Schiedeanus Sttud., Guatemala. 

 Type locality : Coban, Department of Alta Verapaz, Guatemala, on Rubus Schiedeanus. 

 Distribution : Known only from the type locality. 



3. Spirechina Pittieriana (P. Henn.) Arthur. 



Uromyces Pittierianus P. Henn. Hedwigia Beibl. 41 : 101. 1902. 

 Uredo ochraceo-flava P. Henn. Redwigia Beibl. 41 : 101. 1902. 



O. Pycnia epiphyllous, few in crowded groups, soon surrounded by primary uredinia, 

 prominent, honey-yellow becoming golden-brown, subcuticular extending into the epider- 

 mal cells beneath, mammilloid, about 145 /^ broad by 80 ;W high. 



III. Uredinia at first (primary) epiphyllous, few surrounding the pycnia, not crowded, 

 groups 1-3 mm. across, sori irregularly roundish, 0.1-0.3 mm. across, at first bullate, 

 ruptured irregularly, pulverulent, dirty-white when old, rupturing epidermis overarching 

 and moderately conspicuous; urediniospores ellipsoid or obovoid, 18-21 by 29-43 /i; wall 

 nearly colorless, rather thick, 3-4//, slightly thicker above, spinosely and sparsely echinu- 

 late, more pronounced at apex with spines arranged in a crown sometimes more pro- 

 nounced at base forming a tuft directed downward, the pores obscure ; secondary form not 

 well shown, probably hypophyllous with small sori. 



III. Telia hypophyllous, scattered, often more numerous along the edges of the leaf, 

 small, 0.3-0.8 mm., early naked, pulverulent, white, ruptured epidermis inconspicuous; 

 teliospores fusiform or irregularly cylindroid, 15-21 by 40-75 /i, usually narrowed toward 

 both ends ; wall colorless, uniformly thin, 1 /U or less, smooth ; pedicel colorless, half length 

 of spore or less, 6-8// in diameter. 



On Rosaceae : 



Rubus adenotrichos^Q^\^Kih.t,,Q.os\.2.^\^2.. „ . _, ^ ^ ^ ^ ^. ,,„. 



Type locality : Hacienda Belmira near Santa Maria de Dota, Costa Rica, on ''Rubus sp.," 

 determined by W. O. Focke to be R. adenotrichos. 



Distribution : Known only from the type locality. 



