North American Species of Puccinia on Carex 209 



20 X 20-26 fi) wall cinnamon- 

 brown 12. P. universalis. 



Pores considerably above the equator, 

 i. e., in the upper part of spore. 

 Urediniospores small (12-19 X 16- 

 23 it*). 



Teliospores small (29-45 V long).. 13. P. Phrymae. 

 Teliospores medium-sized (25- 



50 fi or more, long) 14. P.asterum. 



Urediniospores medium-sized (15- 

 20 X 19-26 fi). 

 Telia roundish or oval, compara- 

 tively broad 15. P.Peckii. 



Telia mostly oblong or linear, 



comparatively narrow 16. P. patruelis. 



Urediniospores rather large (17-23 X 



24-32 /x), chiefly lenticular 17. P. Sambuci. 



Pores 1 or 2, below the equator. 



Pores 2, slightly below the equator, i. e., 



subequatorial 18. P.Caricis-strictae. 



Pore 1, considerably below the equator, 



near the hilum 8. P. Grossulariae. 



Urediniospores with scattered pores 19. P. karelica. 



B. Aecia exclusively considered 



Aecia scattered, from diffused mycelium Excluded. 



Aecia grouped, from limited mycelium. 



Aecia rupturing by an ostiolar pore Excluded. 



Aecia cupulate. 



Host belonging to family Smilaceae (genus 

 Smilax) . 



Aeciospores medium-sized (15-26,1*), the 



wall uniform Excluded. 



Aeciospores very large (32-51^), the 



wall much thicker above 3. -P. macrospora. 



Host belonging to family Urticaceae. 



Host belonging to genus Boehmeria, aecio- 

 spores very small (10-13 fi) Excluded. 



Host belonging to genus Urtica, aecio- 

 spores medium-sized (15-23 fi) 6. P.urticata. 



Host belonging to family Grossulariae (genus 



Ribes) 8. P. Grossulariae. 



Host belonging to family Lythraceae (genus 



Decodon) 11. P . minutissima. 



Host belonging to family Onagraceae. 



Host belonging to genus Ludwigia or 



Anogra Excluded. 



Host belonging to genus Gaura, Onagra, 



Meriolix, or Pachylophus 15. P.Peckii. 



