46 MARCHANTIACEAE 
5. Ventral view of a thallus-segment, Ж 3. 
6. Thallus-lobe showing young 9 receptacle and position of antheridia, X 3 
7. Margin of thallus-lobe, dorsal view, showing position of the internal ей 
which mark the boundaries of the air-chambers, X 23 (from alcoholic material). 
- Outline of median longitudinal section of thallus with antheridia and young 9 
pacê, Kay 
9. Portion of a transverse section of a thallus-lobe, passing through androecium 
Ха 
. Median region of a transverse section (about тои in thickness), passing through 
a AC AT 
II. Marginal region of the same transverse section, 4 
12. Anterior margin of thallus-lobe from a slightly Ый longitudinal section, Х 
I3 and њи Outlines of cross-sections of mature peduncles, 53 (dried pode 
I5. Outlines of cross-sections of a peduncle from the original material of ** ЛА 
chantia tenera" joe d in Mexico by Humboldt, Х 53 
ection of аҗы peduncle, Х 50 
17. Stoma, surface 
18. Transverse section of thallus-apex with young Ф receptacle, Х 2 
19. Me, section through 9 receptacle with mature sporogonium (slightly sche- 
та гед), X 
20. Vertiea séction of a young 9 receptacle about half way between the vertical 
axis and periphery, traversing one of the “ costae” with its root-hair canal, Х 23. 
2 thin horizontal section of a young 9 receptacle, showing the archegonia in 
cross-section in groups alternating with the root-hair canals, Х 38. 
young antheridium, free in its loculus 225. 
2 А mature antheridium, with wall more or less blended with that of the loculus, 
ЕД 
-27. Keceptacles with mature sporogonia, X 4; 24 and 25, lateral views, the 
former from alcoholic, the latter from dry material ; 26 and 27, dorsal views, the latter 
from a pressed specimen and showing externally the position of the << costae"; 28, ven- 
tral view. 
29. Capsule, apical view, showi ing operculum, X 23 
30 and 31. Vertical sections of capsules-wall, uns the bistratose operculum, 
27. 
32. Spore, outer face, X 305. 
33. Elater, Х 305. 
Figs. 1-3, 
6-12, 16-24, 26, 28-31, from material collected at Fruit Vale, Ala- 
meda Cousty, 
fixed at 1% chromic acid, and preserved in alcohol; 4 from Folsom 
(Mrs. Brandegee); s, dry m aterial, Fruit Vale; 13, 14, 32 and hen dry material, 
D" ei (Mr. W. C. Blasdale e); I5, Mexico (Humboldt) ; 27, Pasadena (Мс- 
tchie 
7. ASTERELLA Pal. de Beauv. р. р. Encyc. Meth. Bot. Suppl. 
1: 502. 1810. 
Fimbraria Nees, Hort. Phys. Berol 44. 1820. [Afterward 
amended to Fimbriaria.] 
