VITTARIA LINEATA 207 
Fic. 14. Side view of portion of prothallium nor inflated cells; a, rhizoids ; 
à, sterigmata with gemmae and also curved apex. 
Fic. 15. Portion of prothallium with apex recurved ; gemmae are shown at the 
margin. a 25. 
Fic. 16. Apex of prothallium, 2; 4, sterigma and gemmae ; d, filament growing 
from the margin ; e, nd f, young prothallium with a sterigma and gemma ; g, 
growing end of filam 87. 
1۲16 17. A ER showing eleven growing points. 
Fic. 18. A filament from a margin of a prothallium. X 45. 
PLATE 24 
Fics. 19-22. Apex of prothallia showing sterigmata and gemmae. EB: 
Fic. 23. Marginal cell, sterigmata and gemmae. X 120. 
Fics. 24-26. Prothallia showing many-celled gemmae. X 25. 
Fic. 27. Gemmae. X 87. 
Fic. 28. Gemmae of six cells : cells a, a forming rhizoids. X 120. 
Fic. 29. Same as Fig. 28, only older. X 87. 
Fic. 30. A gemma of which one cell has sent out a filament of three cells and an 
antheridium. X 87 
Fics. 31, 32. Gemmae with rhizoids. X 35. 
FIG. 33. Gemma, with an antheridium, 4, a rhizoid at each end and small apro- 
thallium originating from two cells. X 45 
Fic. 34. Gemma, with rhizoids and prothallium. X 35. 
Fic. 35. Gemma with a young prothallium originating from a single cell. X 87. 
Fic. 36. A gemma with two withered antheridia, a, a, and a young prothallium, 
from the margin of which have arisen three prothallia ۰ 
IG. ۰ emma of five cells, bearing two rhizoids and two prothallia, the older 
one وت‎ sterigmata and branching in two places. 
G. 38. Portion of the apex of the parent prothallium with two filaments: one 
pr growing and bearing an antheridium, a, and a rhizoid, Û, and the other ا‎ 
(broken) and bearing two rhizoids. 
PLATE 25 
. 39. Gemma showing an antheridium, 2, asa small protuberance from one of 
the ai; the next cell has given rise to a filament of two cells, ^; c, c, rhizoids. 
x 87. 
IG. Gemma with an antheridium, a, showing first wall, 4; c, nuclei; d, 
Fein het EV 120. In places the gemma is more than one cell wide. 
` Fics. 41-49. Stages in the development of the antheridia and antherozoids. 
Fic. 41. a, Nuclei. X 210. 
G. 42. a, Peripheral cell; 5, cap cell; <, central cell dividing into the mother 
cells d the neam X 210. 
Fics. 43-45. is tg the different ways the walls may be formed, in tiers or ob- 
liquely ; a d X 120. 
