йз JUNGERMANNIACEAE 
bestehende Wand, deren Innenschicht in ihren Zellen stets Ver- 
dickungsleisten enthält.” In Gyrothyra, the transverse walls of 
these cells usually appear a trifle thicker than the longitudinal, but 
the walls are otherwise wholly without traces of local thickening. 
In respect to structure of the sporogonial envelopes, Gyrothyra 
is one of several interesting transitions from the ordinary Junger- 
mannia type to the various pouch-bearing genera. Considered 
from this point of view and from certain other gametophytic char- 
acters, its nearest affinities are undoubtedly to be found in that 
section of Малаа represented by JVardia haematosticta (Nees) 
Lindb., of Europe. In manner of dehiscence of capsule it recalls 
the marsupiiferous genus Kantia ; but the valves of Gyrothyra are 
much longer and their cell-walls lack the local thickening, while, 
of course, no generic comparison of the two is necessary so far 
as the gametophore is concerned. 
PLATES 102 AND 103. 
GYROTHYRA UNDERWOODIANA. 
Entire Ф plant, к: 
Cauline leaves, 718. 
Marginal and adjacent leaf-cells, X 225. 
Transverse section through marginal portion of leaf, Ж 216. 
· Underleaves, X 24. ; 
- Transverse sections of stem, X 22, showing ventral callosity from which ја 
root-hairs arise. 
7. Antheridium, 
чу юн 
م 3 
о. 
Median sagittal section of perigynium and adjacent portions of stem, showing 
Porogonium with capsule, seta, foot, and “< involucell ,” also unfertilia 
archegonia, perianth, insertion of bracts, the root-hair callosity, etc., X 23 (slightly 
zed). The free part of Ше perianth as drawn here and in the next is propo" 
7? 
ttal section of mature perigynium from which the seta has been detached, 
; : bl 
f embryo capsule, exhibiting the spiral lines, which presume i 
bound the valves, Х 50. 
: ( 12. 
- Valves of capsules, showing position taken by them when moistened, 4 
12 Apex of a single valve, b ча | 
13 
Ж 36. 
14. Cells of inner surface of capsule valve, Х 150. 
15. Elaters and Spores, 137, 
. Base of dehisced capsule from above, showing spiro-radial insertion of valv 
