18^ NORTH AMERICAN FLORA [Voi^ume 7 



seen edgewise ellipsoid, 20-23 (jl thick, slightly or not at all constricted at the septa, the 

 three cells of about equal size ; wall dark chocolate-brown, moderately thick, 1.5-2.5/^, rather 

 thickly covered, except on the flattened sides, with large spines 6-13 /^ long, 1.5-2 /^ in 

 diameter, gradually attenuate away from the spore, usually minutely branched or forked 

 at the ends, the pores 2 in a cell, lateral, usually near the inner angles ; pedicel colorless, 

 short, deciduous. 



On Ammiackae : 



Ligusticum Cusickii Coult. & Rose, Oregon. 



Ligusiicum Porteri Coult. & Rose, New Mexico. 



Ligusiicum purpureum Coult. & Rose, Washington. 



Ligusiicum scopulorum A. Gray, Colorado. 



Oenanthe californica S. Wats., California. 



Oenanthe sarmeniosa Presl, Washington. 



Selinum pacificum S. Wats., California. 

 Type locality: Mende, France, on Meum athamanticum . 



Distribution : Mountainous region of western United States ; also in Kurope and Japan. 

 Illustration : Beitr, Krypt. Schweiz 22 : /. 292. 



ExsiCCATi : Ellis, N. Am. Fungi 1064; Ellis & Ev. Fungi Columb. 178; Barth. Fungi Columb. 

 2286; D. Griff. W. Am. Fungi J^O; Seym. & Earle, Econ. Fungi Suppl. B 24 ; Sydow, Ured. 889. 



2. Nyssopsora clavellosa (Berk.) Arthur. 



Triphragmium clavellosum Berk. Gard. Chron. 1857 : 21. 1857. 



O. Pycnia unknown, possibly not formed. 



III. Telia epiphyllous, numerous, usually gregarious, crowded in orbicular or some- 

 times irregular groups 1-5 mm. across, on larger discolored, areas, rarely scattered, roundish 

 0.3-0,7 mm. in diameter, sometimes confluent, rather early naked, pulvinate, brownish- 

 black, ruptured epidermis conspicuous ; teliospores laterally flattened, seen flatwise orbicular 

 or somewhat triangular, 26-31 fj- in diameter, seen edgewise ellipsoid, 19-23/* thick, slightly 

 constricted at the septa, the three cells of about equal size ; wall brownish-black, often 

 almost opaque, moderately thin, 1.5-2 /i, covered rather sparingly except on the flattened 

 sides with large spines, 7-12 fJ- long, 1-2 jm in diameter, slightly attenuate away from the 

 spore, minutely forked or branched at the ends, the pores 2 in a cell, lateral, usually near 

 the inner angles ; pedicel colorless, once to twice length of spore, 7-9 [j- in diameter. 



On Araliaceae : 



Aralia nudicaulis L. , Maine, Michigan, Minnesota, New Hampshire, New York, Vermont, 

 Wisconsin ; New Brunswick, Newfoundland, Nova Scotia, Ontario, Quebec. 

 Type locality : Montreal, Canada, on '^Prunus sp." error for Aralia nudicaulis. 

 Distribution : Maine to central New York and northern Minnesota, northward into New- 

 foundland and Canada ; also in Europe and Japan. 



ExsicCATi : Ellis, N. Am. Fungi 1063 ; Thiim. Mj^c. Univ. 844 ; Seym. & Earle, Econ. Fungi 

 Suppl. B 23a, B 23b; Sydow, Ured. 1536; Vesterg. Micr. Rar. Sel. 653 ; Rab.-Wint. Fungi Eur. 

 2918; Barth. N. Am. Ured. 183. 



22. GYMNOCONIA I^agerh. Tromso Mus. Aarsh. 16 : 140. 1894. 



Cycle of development includes pycnia, aecia, and telia, with distinct alternating 

 phases; autoecious. Pycnia subcuticular, other sori subepidermal. 



Pycnia semi-columnar, without ostiolar filaments. 



Aecia erumpent, indefinite, usually crowded thickly over large areas, without peridia 

 or paraphyses. Aeciospores catenulate, globoid or ellipsoid; wall colorless, finely 



verrucose. 



Telia erumpent, definite. Teliospores free, ellipsoid to ovoid, two-celled; wall colored, 

 smooth, or nearly so, the pores one in a cell, apical, or sometimes lateral in the lower 

 cell ; pedicels short, deciduous. 



Type species, Caeonta interstitiale Schlecht. (on Rubus arcticus). 



Aeciospores subgloboid or broadly ellipsoid, the wall thin, 1.5,". 1. G. interstiiialis . 



Aeciospores ovoid or ellipsoid, the wall thick, 2.5-3.5 /£. 2. G. Rosae-gymnocarpae . 



1. Gymnoconia interstitialis (Schlect.) I^agerh. Tromso Mus. 



Aarsh. 16: 140. 1894. 



Caeoma ( Uredo) interstitiale Schlecht. Horae Phys. Berol. 96. 1820. 

 Uredo interstitialis Schlecht. Horae Phys. Berol. 96. 1820. 

 Aecidium nitens Schw, Schr. Nat. Ges. I^eipsig 1 : 69. 1822. 



