Part 3, 1912] ABCIDIACBAE 179 



III. Telia caulicolous and hypophyllous, arising at first from uredinial sori, on hard 

 tissues large, up to 15 mm. long, on soft tissues small, round, 0.5 mm. across, soon naked, 

 pulverulent, chestnut-brown, ruptured epidermis noticeable ; teliospores laterally flattened, 

 seen flatwise discoid or triangular, seen edgewise obovate, 30-45 by 35-48 fi, rounded above 

 and below, slightly or not constricted at the septa, 3-celled, one cell below and two cells 

 above, all of nearly equal size; wall chestnut-brown, moderately thick, 1.5-2.5 /i, irregu- 

 larly verrucose with hyaline beads, especially about the pores ; pedicel colorless, once to 

 once and a half length of spore, fragile, largely deciduous. 



On Rosaceae : 



Filipendula rubra (Hill) B. I^. Robinson {Spiraea lobata Gron., 5. rubra Britton, Ulmaria 

 rubra Hill), Indiana. 

 Type locality : Island of Zealand, Denmark, on Spiraea Ulmaria. 



Distribution : I^afayette, Indiana, in one locality of less than a half hectare extent ; also in 

 Europe and Japan. 



Illustrations : Plow. Brit. Ured. Ustil. pi. 4,f. 6 ; Beitr. Krypt. Schweiz 22 : /. 293. 

 ExsiCCATi : Barth. N. Am. Ured. 83. 



20. AMERIS Arth. Result. Sci. Congr. Bot. Vienne 342. 1906. 



Cycle of development includes telia, and possibly pycnia. 



Telia subepidermal, erumpent, somewhat indefinite. Teliospores free, one-celled; 

 wall colored, somewhat laminate, hygroscopic layer obscure, verrucose, the pores 2 or more» 

 lateral . 



Type species, Uromyces rosicola Bllis & Bv. (on Rosa Engelmanni) . 



1. Ameris rosicola (Ellis & Ev.) Arth. Result. Sci. Congr. 



Bot. Vienne 342. 1906. 



Uromyces rosicola Ellis & Bv. Am. Nat. 31 : 427. 1897, 



O. Pycnia unknown, probably not formed. 



III. Telia hypophyllous, usually crowded over the whole under surface of the leaflets, 

 confluent, irregular and often tortuous, long covered by the epidermis, dark chestnut-brown, 

 ruptured epidermis very conspicuous; teliospores globoid, 29-34 by 32-39 /i; wall dark 

 chestnut-brown, 2-3// thick, very coarsely and rather unevenly verrucose with closely set, 

 semi-hyaline beads ; pedicel colorless except close to spore, about length of spore or 

 shorter, stout, 7-10 /^ in diameter, somewhat attenuate downwards, the pores obscure, 2 or 

 3, lateral. 



On Rosacbae : 



Rosa Engelmanni S. Wats., Nebraska. 

 Type locality: Crawford, Nebraska, on ''Rosa Eendleri?,^' now determined as R. Engel- 

 manni. 



Distribution : Plains of northwestern Nebraska. 



21. NYSSOPSORA Arth. R&ult. Sci. Congr. Bot. Vienne 342. 1906. 



Cycle of development includes telia, and possibly pycnia. 



Telia subepidermal, erumpent. Teliospores triangularly three-celled by oblique parti- 

 tions, laterally flattened; walls colored, spinous, the pores two in a cell, lateral, usually 



near the inner angles. 



Type species, Triphragmium echinatumJJin^s: (on Meum athamanticum) . 



Telia amphigenous, irregular, large, 0.7-3 mm. or more across. 1. ^V;. echinata. 



Telia epiphyllous, roundish, small, 0.3-0.7 mm. across. 2. N. clavellosa, 



I 



1. Nyssopsora echinata (Lev.) Arth. Result. Sci. Congr. 



Bot. Vienne 342. 1906. 



Triphragmium echinatum L^v. Ann. Sci. Nat. III. 9 : 247. 1848. 



O. Pycnia unknown, possibly not formed. 



III. Telia amphigenous, numerous, irregular, 0.7-3 mm. or more across, early naked, 

 slightly pulverulent, somewhat pulvinate, blackish, ruptured epidermis conspicuous ; telio- 

 spores laterally flattened, seen flatwise orbicular or somewhat triangular, 26-31 by 29-34 m. 



