ASTERELLA 51 
6. Ventral view of thallus, natural size. 
7. Outline of transverse section of 2 thallus, near apex, Х 23. 
8. Outline of transverse section through androecium, Х 23. 
9. Outline of longitudinal section through androecium, X 12. 
10. А very thin median longitudinal section of thallus, Х 48. 
II-I3. Ventral scales, 12 
14. Cross-section of young peduncle, X 41. 
15. Cross-section of a mature peduncle, Х 23. 
16. Surface view of stoma from near thallus-apex, Х 305. 
17. Outline of portion of longitudinal section of thallus passing through a young 
receptacle, Х 23. 
18. Section of Ф receptacle in a plane perpendicular to Ше peduncle, showing 
two archegonia in transverse section in each lobe, one of each group fertilized and sur- 
rounded by the developing pseudoperianth, 23. 
-21. Ф receptacles, the first young, the others with matured sporogonia, Х 4. 
22, Sectional view of a dolioform stoma from © receptacle, 225 
23. Outline of mature sporogonium, 12. 
24. Capsule after dehiscence, 12. 
25. Spore, outer face, Х 225. (The folds and ridges of the epispore become 
sometimes more numerous than here represented. ) 
26. Spore, inner faces, Х 225. 
27. A portion of the wing-margin of spore, showing the minute reticulation, Х 
305. 
28. Sections of fully matured spores, showing the great development of the epi- 
sporic layer, 225. e section on the left passes considerably to one side of the cen- 
ter of the spore and consequently gives a somewhat exaggerated idea of the thickness of 
еріѕроге in comparison with the width of the lumen. 
29. Elaters, У 225 
Figs. 11-13 drawn from material collected by Mr. J. Burtt Davy in Calaveras 
County ; 25-27, and 29, from Oak Run, Shasta County (M. S. Baker and F. P. Nut- 
ting); the remaining from specimens collected by the author in Mill Valley and near 
Berkeley. 
2. AsrERELLA Воглхрекі (Aust. Underw. Bot. Gaz. 20: 61.. 
1895. 
Fimbriaria Bolanderi Aust. Proc. Acad. Nat. Sci. Philad. 
1869: 230. 1860. 
tinctly porose, scarcely areolate, light green above, usually ии 
below, rounded or very slightly emarginate at Ше apex, хай У 
flat or lightly concave when living, Ше membranous, undu 51 
crenate, brown or purple margins often erect and appressed- 
connivent on drying, air-cavities small, scales dark purple, not 
reaching the margin, the costa densely clothed with matted root- 
