Part 3, 1912] AECIDIACBAE 219 



29. POLIOMA Arth. Jour. Myc. 13 : 29. 1907. 



Cycle of development includes pycnia and telia, both subepidermal. 



Pycnia globoid or flask-shaped. 



Telia erumpent, somewhat indefinite, without peridium or paraphyses. Teliospores 



two-celled, usually germinating in situ upon maturity; wall pale or colorless, generally 

 smooth . 



Type species, Puccinia nivea Holway (on Salvia purpurea) . 



Teliospores long, 48 p. or more. 

 Teliospores short, 40-48u. 



1. P. nivea. 



2. P. delicatula. 



1. Polioma nivea (Holway) Arth. Jour. Myc. 13: 29. 1907. 



Puccinia nivea Holway, Jour. Myc. 11 : 158. 1905. 



O. Pycnia epiphyllous, in small groups, inconspicuous, subepidermal, honey-yellow, 

 globose-flask-shaped, almost wholly immersed, large, 130-160 m broad by 11 0-145 ju high; 

 pycniospores globoid, 3-4/^ in diameter. 



Ill, Telia chiefly hypophyllous, gregarious, often confluent, in compact groups, 1-2 

 mm. across, round, 0.3-0.4 mm. in diameter, soon naked, pulvinate, dirt3^-white becoming 

 cinereous by germination, ruptured epidermis not noticeable; teliospores clavate- oblong, 

 rounded or obtuse at apex, 21-23 by 48-61 /x, slightly constricted at the septum ; wall color- 

 less, moderately thin, 1-2 /x, slightly or not thickened at apex, smooth; pedicel hyaline, 

 short. 



On Lamiaceae : 



Salvia purpurea ^^v .^ Oaxaca. 

 Type locality : Oaxaca, Mexico, on Salvia purpurea . 

 Distribution : Known only from the type locality. 



2. Polioma delicatula Arth. Jour. Myc. 13 : 29. 1907. 



O. Pycnia unknown. 



III. Telia hypophyllous, scattered or sometimes confluent in compact groups, round, 

 0.3-0.4 mm. across, soon naked, pulvinate, dirty- white becoming cinereous by germination, 



ruptured epidermis not noticeable ; teliospores oblong or lanceolate-oblong, rounded or 

 obtuse at apex, 12-15 by 40-48 /x, slightly or not constricted at septum ; wall colorless, 

 moderately thin, 1-2 /x, not thickened above, smooth ; pedicel hyaline, short. 



On Lamiaceae : 



Salvia elegans Vahl, Mexico (state). 

 Type locality : Sacred Mount, Amecameca, Mexico, on Salvia elegans. 

 Distribution ; Known only from the type locality. 



30. NIGREDO Roussel, Fl. Calvados ed. 2. 47. 1806. 



Uredo § Nigredo Pers. Syn. Fung. 220. 1801. 



Caeoma § Caeomurus Link, Ges. Nat. Freunde Berlin Mag. 3 : 7. 1809. 



Hypoderrmum § Uromyces Link, Ges. Nat. Freunde Berlin Mag. 7 : 28. 1815. 



Caeomurus S. F. Gray, Nat. Arr. Brit. PI. 1 : 541. 1821. 



Uromyces Unger, Exanth. Pfl. 277. 1833. 



Capitularia Rab. Bot. Zeit. 9 : 449. 1851. 



Puccinella Fuckel, Symb. Myc. 60. 1869. 



Cycle of development includes pycnia, aecia, uredinia, and telia, with distinct alternat- 

 ing phases ; autoecious and heteroecious. Pycnia and other sori subepidermal. 



Pycnia deep-seated, usually globoid or flask-shaped, with ostiolar filaments. 



Aecia erumpent, cupulate or cylindrical. Peridium colorless, dehiscent by apical rup- 

 ture, the margins lacerate or erose, erect, spreading, or recurved. Aeciosporescatenulate, 

 globoid or ellipsoid, often angular ; wall colorless, verrucose. 



Uredinia erumpent, definite, without peridium, and without paraphyses (except in a few 

 species) . Urediniospores borne singly on pedicels, globoid, ellipsoid, or obovoid; wall colored, 

 echinulate or rarely verrucose, the pores two to several (one in N. uniporula)^ variously 

 arranged. 



