115 
apical areolation, its pluri-stratose nerve, the longer beak of its lid, 
its narrow and persistent annulus, and the peristome incurved’ 
when dry. 
EXPLANATION OF FIGURES. 
(PLATE CXLIII.) 
DITRICHUM MONTANUM, LEIBERG. 
Fig. 1. Plant natural size. 
Fig. 2. Capsule with lid and portion of pedicel. 
Fig. 3. Calyptra. 
Fig. 4. a, Cross-section of capsule at maturity; 4 b. same when old and dry. 
Fig. 5. a. Peristome; 5. b. basilar membrane; 5. c. reticulation of capsule at 
mouth ; 5. d. same near base. 
Fig. 6. One of the sheathing pericheetial leaves. : 
Fig. 7. Apex of leaf with margin rolled back; 7. a. fragment of upper one-third 
of leaf; 7. b, fragment of central portion of leaf; 7. c. same at base. 
Fig. 8. Outline of a stem leaf. 
Fig. 9. Two-perigonial leaves with antheridia, __ 
Fig. 10. a., 10. b. and 10. c. sections of the costa and portions of the lamina of a 
stem leaf. 
Fig. 11. Fragment of leaf from near apex to show double row of marginal cells. 
Fig. 12. Male bud. 
All the figures, except No. 1, highly magnified. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig, 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
OO ON An pW NH 
om 
Lond 
12. 
(PLATE CXLIV.) 
GRIMMIA PACHYPHYLLA, LEIBERG. 
. A plant of natural size showing usual mode of branching. 
. One of the sub-simple plants growing with the normal form of Fig. 1. 
. Fragment of a branch showing usual position of antheridial inflorescence. 
Calyptra. 
- Capsule and perichetium. 
. The inner antheridial bract. 
. An antheridium 
. An old and dry capsule. 
. A stem-leaf. 
. Fragment of leaf margin from near apex of leaf. 
. Upper areolation. : ‘i 
Medial areolation. 
. Basilar areolation, about 450. 
Cells of the angles and extreme leaf base. 
Section, unprepared, from upper portion of leaf under low magnification. 
Section from middle of leaf treated with dilute nitric acid to bring into 
view the pluristratose charactor of costa. 
Fig. 17. Hair point of leaf. 
Fig. 18. Section from lower portion of leaf, 
Fig. 19. Three of the teeth of the peristome with fragment of annulus. 
