230 NORTH AMERICAN FLORA [Voi^UME 7 



18. Nigredo Aegopogonis (Dietel & Holway) Arth. R6sult. Sci. 



Congr. Bot. Vienne 343. 1906. 



Uromyces Aegopogonis Dietel & Holway ; Holway, Bot. Gaz. 24 : 25. 1897. 



O and I. Pycnia and aecia unknown. 



II. XJredinia hypophyllous, rarely epiphyllous, scattered, oblong- or linear, 0.5-0.8 mm. 

 long, early naked, somewhat pulverulent, light cinnamon-brown, ruptured epidermis 

 noticeable ; urediniospores globoid or obovoid, 16-19 by 19-23 )u ; wall light cinnamon- 

 brown, moderately thin, 1.5-2^, moderately echinulate, the pores 6-8, scattered. 



III. Telia hypophyllous, scattered, oblong- ellipsoid or somewhat linear, 0.4-1 mm. 

 long, soon naked, pulvinate, blackish-brown, ruptured epidermis not noticeable ; teliospores 

 globoid, 19-26 ;uin diameter, rounded above and below ; wall chestnut-brown, slightly darker 

 above, rather thin, about 1.5 m, thicker at apex, 5-7 ju, smooth ; pedicel slightly tinted, firm, 

 about once to once and a half length of spore. 



On Poaceae : 



Aegopogon cenchroides ^.'Q.^., Mexico (state). 



A egopogon geminij^oi^us H.B.'K.y Mexico (state), Morelos. 



A egopogon gracilis Vasey, Mexico (state). 



Paspalum velutinwm Kunth, Michoacan. 

 Type locality : Near City of Mexico, Mexico, on Aegopogon cenchroides . 

 Distribution : Central Mexico. 



19. Nigredo Peckiana (Farl.) Arth. R&ult. Sci. Congr. Bot. 



Vienne 344. 1906. 



Uromyces Peckianus Farl. Proc. Am. Acad. 18 : 78. 1883. 

 Caeomurus Peckianus Kuntze, Rev. Gen. 3=* : 450. 1898. 



0. Pycnia amphigenous, gregarious, usually in roundish groups 0.5-1.5 mm. across, 

 punctiform, honey-yellow becoming brownish, globoid, 100-135 y. in diameter ; ostiolar fila- 

 ments 30-65 ju long. 



1. Aecia amphigenous, gregarious or sometimes solitary, rather loosely arranged in 

 groups 1.5-2.5 mm. across, cylindrical, often rather long, 0.2-0.3 mm. in diameter; peridium 

 yellowish or whitish, rather tardily dehiscent at apex, the margin erect or spreading, irregu- 

 larly lacerate; peridial cells rhombic or rhomboidal, 24-28 /i long, the outer wall thick, 

 6-9 /x, striate, the inner wall thinner, 2-3 ju, verrucose ; aeciospores globoid, 14-20 by 18-23 ii ; 

 wall thin, about l/x, evenly and finely verrucose. 



On Chenopodiaceae : 



Atriplex paiula I^., Nova Scotia. 



Chenopodium album L., Nova Scotia. 



Dondia m.aritim,a (I^.) Druce [Sueda m-aritim-a Dumort.), Nova Scotia. 



Salicornia am.bigua Michx., Washington. 



Salicornia herbacea I^. , Nova Scotia. 



II. Uredinia epiphyllous, scattered, oblong or linear, 0.4-1 mm. long, early naked, 

 pulverulent, cinnamon-brown, ruptured epidermis noticeable ; urediniospores broadly 

 ellipsoid or globoid, 16-23 by 18-26 m; wall pale cinnamon-brown, rather thick, 2-2.5 m, 

 finely and evenly verrucose, the pores about 6, scattered. 



III. Telia amphigenous, scattered, oval or oblong, 0.1-0,3 mm. wide by 0.3-0.8 mm. 

 long, early naked, pulvinate, blackish-brown, ruptured epidermis not conspicuous; telio- 

 spores obovoid or ellipsoid, 16-21 by 24-35 ju, rounded or obtuse above, often narrowed 

 below; wall chestnut-brown or lighter, concolorous, 2-2.5 ju thick, usually somewhat thicker 

 ■above, 4-9^, smooth ; pedicel slightly tinted, about once to twice length of spore. 



On Poaceae : 



Distichlis sptcata (L.) Greene {D. maritima Raf., Brizopyrum spicatum Hook.), Cali- 

 fornia, Florida, Massachusetts, New Jersey, New York, Washington ; Nova Scotia. 

 Type locality : Gloucester, Massachusetts, on Brizopyrum spicatum. 

 Distribution : Saline soil along: the Atlantic and Pacific coasts. 



KxsicCATi: Ellis, N. Am. Fungi 240; Rab.-Wint. Fungi Bur. 3411; Svdow, Ured. 1805; 

 Earth. Fungi Colunib. 3195. 



