60 Haynes: AYTONIA 
PLATE 6, Aytonia jamaicensis sp. NOV. 
1. Plant, natural size. 
2 and 3. Outlines of cross-sections of thallus, X 9. 
4. Median cross-section of thallus showing stoma, X 55. The fungal hyphae 
shown here in certain cells were found inalmost all specimens examined and occur 
generally os the ventral ceria of the thallus, 
5. Stoma, X 242. 
6 and xe Upper and lower sides of a single immature carpocephalum, > 6 
8 and 9. Opposite sides of a single carpocephalum with two mature sporogonia, 
no. 8 showing upper portion of peduncle, < 6 
1o and 11. Opposite sides of a single carpocephalum showing the mature sporo- 
gonia, a third abortive one, and upper portion of peduncle, >< 
12, Ventral scale showing geminate appendicula, 17 
13. Ventral scale showing single appendiculum, 17. 
14-17. Scales from the carpocephalum, 13. 
18 and 19. Scales from the sibs cobeilankuie showing cells, 55. 
20. Surface view of stoma, & 360. 
21. Surface view of epidermal cell and trigones, 250. 
22. Spore, inner — < 250; 
23. Spore, outer 2 
24. Spore, ola ae: MK 242. 
25. Elater, 2-spiral, 182. 
26. Elater, 3-spiral, 175. 
27. Oil-body completely filling cell, 250. 
28. Scale from androecium, 55. 
