Helotium 



115 



On fallen leaves of Betula etc. 

 On decaying leaves. 

 Spores clavate. 

 Spores fusoid. 

 On rotten wood. 



Apothecia cudonioid. 

 Apothecia not cudonioid. 

 Spores usually 10-15 n long. 

 On coniferous plants. 



On fallen leaves of Picea. 



Apothecia pallid, with Fnmosa. 

 Apothecia sulphur-yellow. 

 On fallen leaves of Larix. 

 Not on coniferous plants. 

 On seeds of Alnus oregona. 

 Not on seeds. 



On old fungus, Dichaena strmiiosa. 

 Not on fungi. 



On herbaceous plants. 



Apothecia dark-brown or black. 

 On stems of Erigeron. 

 On leaves of Antenuaria. 

 Apothecia yellowish or cinereous. 

 On stems of EsclischoUzia. 

 On various plants especially 

 Impatiens. 

 Not on herbaceous plants. 

 Spores reniform. 



Apothecia yellowish-green, on 

 (usually) petioles of Fraxinus. 

 Apothecia not yellowish-green. 

 On rotten wood. 



Apothecia lemon-yellow. 

 Apothecia pallid or yel- 

 lowish. 

 Spores clavate, on 



Sympiioricarpns. 

 Spores not clavate. 

 Apothecia not 

 over 1 mm. in 

 diam. 

 Apothecia 3 mm. 

 in diam. on 

 Salix. 

 On dead leaves. 



Apothecia yellow to pale- 

 orange. 

 On leaves of Fagus. 



12. H. Linderi. 



13. H. naviculasporum. 



14. H. epiphyllum. 



15. H. cudonioides. 



16. H. virgullorum. 



1 7. H. fumoseUum. 



18. H. sulphuratum. 



19. H. acicularum. 



20. //. seminicola. 



21. //. strumosum. 



22. H. nigrescens. 



23. //. phaeoconium. 



24. H. Eschscholtziae. 



25. H. herharum. 



26. H. renisporum. 



27. //. Uiteovirescens. 



28. //. citrinum. 



29. H. dakotense. 



30. //. pallescens. 



31. H. amplnm. 



32. H. alhopunctum. 



