1963] 



LISTS AND KEYS OF THE CEDAR RUSTS OF THE WORLD 



311 



18. Inner and side walls 2-2.5 ll thick, aeciospore-wall 2-2.5 ll. cornutum. 

 17. Inner and side walls densely and rather finely rugose. 



19. Aeciospore-wall dark cinnamon-brown, aeciospores 18-25 X 20-29 /*. 



hemisphericum. 



19. Aeciospore-wall yellowish brown, aeciospores 18-23 X 23-38 ll. fenzelianum. 

 8. Peridium tardily or not at all dehiscent at apex, with slits along the sides. 

 20. Peridial cells tuberculate. 



21. Papillae on side-walls short, aeciospore-wall 1.5-2.5 ll. yamadae. 

 21. Papillae on side-walls blunt, aeciospore-wall 2.5-3.5 it. Icernianum. 

 20. Peridial cells verrucose with roundish or oval papillae. corniculans. 

 20. Peridial cells verrucose-rugose with irregular papillae. cupressi. 

 20. Peridial cells rugose with closely set ridge-like papillae. davisii. 

 20. Peridial cells smooth. biseptatum. 

 7. Peridium more or less tubular, altered by becoming lacerate or fimbriate. 

 22. Peridium strongly revolute. 



23. Peridial cells somewhat curved when wet, side-walls rugose nearly to outer 



side. floriforme. 

 23. Peridial cells strongly curved when wet, side-walls sparsely rugose on in- 

 ner half. juniperi-virginianae. 

 22. Peridium spreading or more or less erect after dehiscence. 



hyalinum. 



24. Peridial cells smooth. 

 21. Peridial cells sculptured. 

 25. Peridial cells subspinulose. 

 25. Peridial cells verrucose. 

 2(3. Peridial cells rhomboidal. 



27. Aeciospore-wall chestnut-brown. 

 27. Aeciospore-wall pale-yellow. 

 28. Aeciospores 21-24 X 24-29 ll. 

 28. Aeciospores 21-32 X 24-39 /x. 

 26. Peridial cells linear ( 150-300 ll) , 



much curved or coiled when 



trachysorum. 



turkestanicum. 



speciosu m. 



clavipes. 

 wet. 



fraternum. 



26. Peridial cells oblong (80-130 ll) , slightly curved when wet. 



clavariiforme or gracil 



25. Peridial cells rugose. 



27. Peridium short (0.5 to 1 or 2 mm high). 

 28. Aeciospores small (17-22 X 19-26 it). 



29. Aeciospore-wall cinnamon-brown, 2.5-3.5 ll. 



29. Aeciospore -wall very pale cinnamon-brown 2-2.5 ll 

 28. Aeciospores medium-sized (18-27 X 19-35 /x). 



30. Aeciospore-wall rugose (2-2.5 ll). 

 30. Aeciospore-wall verrucose. 



31. Aeciospore-wall yellow-brown, 3-5 ll. 



31. Aeciospore-wall light chestnut-brown, 1.5-2 it. 



31. Aeciospore-wall dark chestnut-brown (2-2.5 ll). 

 28. Aeciospores large (28-35 X 30-45 ll). 

 27. Peridium more or less elongated (1.5-4 mm high). 

 32. Aeciospores small (15-19 X 18-25 it), wall 1.5-2 p. 



32. Aeciospores larger (15-26 X 18-32 ll) , wall 2.5-3.5 it. 

 27. Peridium further elongated (2-5-6 mm or more). 



33. Aeciospores large (18-24 X 19-35 ll). 

 33. Aeciospores small (16-18 X 18-23 ll. 

 33. Aeciospores medium-sized (18-24 X 19-30 ll). 



34. Aeciospore-wall cinnamon-brown, 1.5-2.5 ll. 

 34. Aeciospore-wall chestnut -brown, 2.5-3 it. 



confusu m. 

 exterum. 



distort urn. 



sikangense. 

 cun n inghamia n u m. 

 * bermudianum. 

 tremelloides. 



globosum. 

 nidus-avis. 



fusisporum. 

 shiraianum. 



tor minali- juniper in uni. 



betheli. 



Peridium balanoid, rupturing along sides, apex remaining bluntly conical. fuscum. 



Telial Stage Exclusively Considered 



Telia foliicolous, or on green stems, with no or slight hypertrophy. 

 2. Telia causing fasciation of the branches (witches' brooms). 



3. Witches' brooms globose, with scale-bike leaves, sori bluntly conical. 



kernian um. 



* This is the only known species which is autoecious; here the. aecia are on Juniper us. 



