182 NORTH AMERICAN FLORA [V01.UME 7 



III. Telia unknown. 



On Rosaceae : 



Rosa gymnocarpa Nutt., California. 

 Type locality : California, on Rosa gymnocarpa. 

 Distribution : Northern to southern California on the Pacific slope. 



23. XENODOCHUS Schlecht. I^innaea 1 : 237. 1826. 



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

 autoecious. Pycnia subcuticular, other sori subepidermal. 



Pycnia flattish, without ostiolar filaments. 



Aecia erumpent, indefinite, without peridium or paraphyses. Aeciospores ellipsoid ; 

 wall colorless, verrucose. 



Telia erumpent, somewhat indefinite. Teliospores free, cylindrical, three- to many- 

 celled by transverse septa; wall colored, smooth, the pores 2 in a cell, opposite, in upper 

 part near the septa, one and apical in the uppermost cell ; pedicels hvaline, short. 



Type species, Xenodochus carbonarius (on Sanguisorha officinalis). 



1. Xenodochus minor Arthur, sp. nov. 



O. & I. Unknown. 



III. Telia amphigenous and caulicolous, rounded or elongate, 0.75-1.5 mm. across*by 

 2-5 mm. or more long, often confluent, pulvinate, early naked, blackish-brown, ruptured 

 epidermis conspicuous ; teliospores 3-7-celled, usually 6, elongate, cylindrical, or rarely 

 somewhat clavate, often curved, 16-21 by 40-140 /i, somewhat constricted at the septa, 

 lower cells sometimes longer than upper ones; wall light chestnut-brown, concolorous, or 

 paler at base, moderately thick, 1.5-2//, smooth, or sometimes with one or a few small hya- 

 line papillae at apex, the pores 2, opposite, in upper part of each cell near the septum, 

 except uppermost cell which has one apical pore ; pedicel hyaline, as long as lowest cell 

 or shorter, 6-9 /^ thick, slightly narrowed downward. 



On Rosaceae : 



Sanguisorha latifolia (Hook.) Coville, Alaska. 

 Type collected at Karluk, Kadiak Island, Alaska, 1902, W. T. Home. 



24. SPIRECHINA Arth. Jour. Myc. 13 : 30. 1907. 



Cycle of development includes pycnia, uredinia, and telia ; autoecious. Pycnia sub- 

 cuticular, other sori subepidermal or infra-epidermal. 



Pycnia flatten ed-hemispherical, without ostiolar filaments. 



Uredinia ^erumpent, definite, without peridium or paraphyses. Urediniospores borne 

 singly on pedicels, ellipsoid; wall nearly colorless, echinulate or echinulate-verrucose, 

 often in spiral lines, the pores obscure ; contents colored. 



Telia erumpent or superficial, definite, without paraphyses. Teliospores borne singly 

 on pedicels, obovate or lanceolate-obovate, one-celled; wall nearly or quite colorless, 

 smooth, the pore apical. 



Type species, Uredo Loeseneriana P. Henn. (on Ruhus sp.). 



Urediniospores spirally marked ; teliospore-wall thicker above, 



Urediniospores spirally beaded ; teliospores not coronate. 1. ^S. Loeseneriana. 



Urediniospores spirally winged ; teliospores coronate. 2. S. Arihuri. 



Urediniospores not spirally marked ; teliospore-wall uniformly thin. 



Urediniospores coronate ; telia conspicuous. 3. S. Piiiieriana. 



Urediniospores not coronate. 



Urediniospores spinosely echinulate ; telia inconspicuous. 4. S. Rubi. 



Urediniospores minutely echinulate ; telia conspicuous. 5. 5. epiphylla, 



1. Spirechina Loeseneriana (P. Henn.) Arth. Jour. 



Myc. 13: 30. 1907. 



Uredo Loeseneriana P. Henn. Hedwigia37: 273. 1898. 

 Uromyces Usterii Speg. Rev. Mus. La Plata 15 : 7. 1908. 

 Uromyces Loesenerianus Sydow, Monog. Ured. 2 : 202. 1910. 



O. Pjmcia amphigenous and caulicolous, numerous, scattered over more or less globu- 

 lar galls preceding the uredinia, inconspicuous, honey-yellow becoming golden-brown, 



