PLATE 29 



Fig. 9. Portion of ascoeaip of Hydnocystis calif orii tea sp. nov. 



Fig. 10. Asciis and spore of Geiiea TJarlcnessii sp nov. x 400 diani. 



Fig. 11. Ascus of Genea Harknessii. x 400 diam. 



Fig. 12. Spore of Genea Harknessii. x 400 diam. 



Fig. 13. Paraphyses of Genea Harknessii. x 400 diam. 



Fig. 14. Spore of Genea intermedia nom. nov. x 400 diam. 



Fig. 15. Spore of Tuber gihhosum. x 350 diam. 



Fig. 16. Spore of Tuber irradians sp. nov. x 400 diam. 



Fig. 17. Spore of Tuber irradians. x 400 diam. 



Fig. 18. Spore of Tuber citrinum. x 500 diam. 



Fig. 19. Spore of Tuber separans sp. nov. x 400 diam. 



Fig. 20. Spore of Tuher californieum. x 500 diam. 



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