Campbell.—Studies on some East Indian Hepaticae . 337 
Wiesnerella is especially interesting, as it is on the one hand unmistak¬ 
ably closely related to Dumortiera, while on the other it is obviously con¬ 
nected with the typical Marchantiaceae. It may be fairly said to connect 
forms of the type of Marchantia with the reduced Dumortiera . About the 
only evidence of reduction in Wiesnerella is the character of the stomata, 
especially those upon the receptacle. 
The writer is indebted to Professor II. L. Lyon of Honolulu for mature specimens of the two 
Hawaiian species of Dumortiera. The -carpocephala and spores of the smooth form are in¬ 
distinguishable from those of the East Indian D. trichocephala. The other species is evidently not 
D. velutina, as suggested by the writer, but is probably D. hirsuta, which Stephani records 
for Hawaii. 
DESCRIPTION OF PLATES VIII AND IX. 
Illustrating Professor Campbell’s paper on Studies on some East Indian Hepaticae. 
PLATE VIII. 
All figures refer to Dumortiera calcicola , sp. nov. 
Fig. 1. A, sterile; b-d, fertile plants, x 2. 
Fig. 2. Fertile plant, showing extensive adventive branching, x 2. 
Fig. 3. Apex of a sterile shoot, showing the outlines of the air-chambers, x 25. 
Fig. 4. Vertical section of the shoot-apex. x 380. a-, apical cell ; L-L, air-chambers; 
sc., ventral scale. 
Fig. 5. Vertical section of the thallus. x 380. 
Fig. 6. Longitudinal section of a shoot, showing antheridial and young archegonial receptacles, 
x 50. 
Fig. 7. Outline of antheridial receptacle, x 25. 
Fig. 8. Section of young archegonial receptacle, x 92. 
Figs. 9-10. Archegonia. x 380. 
Fig. 11. Outline of young archegonial receptacle, x 25. sc., ventral scales. 
Fig. 12. Antheridia. x 95. 
PLATE IX 
All figures refer to Wiesnerella. 
Fig. 13. Fertile specimen, x 2. 
Fig. 14. Carpocephalum, seen from above, x 3. 
Fig. 15. Open sporogonium. x 5. 
Fig. 16. Median longitudinal section of the thallus, passing through the apex, x 125. 
Fig. 17. Apex of a shoot, showing the formation of the air-chambers, L. x 640. x, 
apical cell. 
Fig. 18. Horizontal section of thallus-apex. 
Fig. 19. Vertical section of air-chamber and stoma, x 380. 
Z 3 
