(457) 



Roestelia fimbriata Arth. Bull. Torrey Club 28: 666. 1901. 

 Aecidium fimbriatum Farlow, Bibl. Index 1: 44. 1905. 

 Gymnosporangium penicillatum Liro, Ured. Fenn. 405. 1908. 



Aecia hypophyllous, in annular or crowded groups, 2-5 mm. 

 across, on larger thickened discolored spots, at first cylindric, 

 0.5-1.5 mm. high, 0.5-1 mm. in diameter; peridium soon becoming 

 finely fimbriate to base and somewhat twisted or incurved; peridial 

 cells usually seen only in side view, rhomboid, very thick, 30-35 

 X 60-90^, outer wall medium thin, 2-3^., smooth, inner wall medium 

 thick, 7-10/i, rugose, side walls very coarsely rugose with thick, 

 somewhat irregular ridges, 

 roundish o 

 like papill 



aeciospores globoid, very 

 large, 28-35X30-45^, wall 

 chestnut-brown, thick, 3- 

 5,u, rather finely verrucose. 



Telia caulicolous, appear- 

 1 hemispheric swellings 

 • ~ • : akin. 



r elongate ridge- 



(1-4 



forth along the sides of the 





er) on the smaller branches, ap- 

 planate, indefinite, usually of considerable size, often covering the 

 whole hypertrophied area, sometimes becoming patelliform when 

 expanded, chocolate-brown; teliospores 2-celled, ellipsoid 18-28 X 

 42-61/u, usually slightly narrowed both above and below, slightly 

 or not constricted at the septum, wall cinnamon-brown, 1-1.5^ 

 thick; pores usually 3 in the upper cell, 1 apical, 2 near the septum, 

 in the lower cell 2 near the septum. 



For the aecia: Malus Mains (L.) Britton (Pyrus Mains L.) 

 (in Europe only), Sorbus Aria Crantz, S. Chasmaemespilus 

 Crantz, S. Hostii Koch (S. AriaXChaemaemespilus), 

 S. hybrida L. (S. AriaX aucuparia), S. latifolia Pers. (S. 

 AriaXtorminalis), S. occidentalis (Wats.) Greene, S. scopu- 

 lina Greene, S. sitchensis Roem. 

 For the telia: Jnniperus communis L., /. sibirica Burgsd. 

 (/. nana Willd.). 

 Type locality: Sweden, on Jnniperus [communis]. 

 Distribution: Rocky Mountains from Alberta and British 

 Columbia south to Colorado; and in Europe. 



Illustrations: Beitr. Krypt. Schweiz. 2 2 : /. 277; Hedwigia34: 

 3,/. 1; Bot. Gaz. 49: pi. 21, f. 8; E. & P. Nat. Pflanzenfam. I 1 **: 

 /. 33, C, D, E; Forst. Nat. Zeits. 4: 348,/. 1-3, 14-16. 



