208 THE Lire HISTORY OF 
Fics. 46, 47. Looking down on the antheridium, showing the mother cells, @ 
10. ; 
Fic. 48. A ripe antheridium with the mother cells, æ, lying free, each one con- 
taining an antherozoid. 
Fic. 49. An antheridium with two antherozoids still inside ; a, ruptured cap cell; 
the antheridium also showing the inflated peripheral cell, and inflated upper portion of 
the pedice O. 
Fic. 50. Three antherozoids, a; 4, cilia; c, portion of mother cell. X 600. 
Fics. 51, 52. Two antheridia consisting of more than one peripheral cell. >< 210. 
IG. 53. Gemma with three antheridia, one in the act of discharging the anther; 
ozoids; a, rhizoid. X 88 
Fics. 54, 55. Gemmae with antheridia, a, and rhizoids, 6. \ 120. 
Fic. 56. Anantheridium from near margin of parent prothallium ; a, antheridium; 
û, pedicel. I 
Fic. 57. Under side of wing of prothallium showing archegonia, a, 4, the four 
stigmatic cells. X 87. 
Fic. 58. A ge with young sporophyte ; a, prothallium ; 4, archegonia ; c- 
first leaf of young plant; ¢, root; e, root hairs ; Jj foot, y, scales around the growing 
tip of rhizome and next leaf AE 
Fic. 59. Wing of a prothallium with three young archegonia, a, and sporophyte, 
X ۰ 
Fic. 60. a of Fig. 59 magnified 35 times, to show young archegonia, 4; ¢, foot 
imbedded in the calyptra ; d, rhizome ; 5 €, root. 1 
PLATE 6 
I 61. Longitudinal section of rhizome near apex, a; 5, young leaf; c, scales. 
d Fic. 62. A portion of the same showing the differentiating tissues: a, apical por- 
ion ; Û, epidermis; c, cortical êr d, vascular bundle; e, medullary paren- 
PEM Í, young scales, 
Fic. 63. Cross section of rhizome near tip, a, cortex ; 4, meristem of bundle; % 
medullary parenchyma. 0. 
à IG. 64. The same further from tip, a, cortex; 5, medullary Be 5 
phloém ; 4, xylem, the walls of the tracheids thickening. x 120. 
Fic. 65. Older portion of rhizome. Marking as in Fig. 64. X 120. 
A T - Cross section of the tubular bundle, a ; showing two root bundles, 4 and 
: and the two bundles of a leaf, g, d; with a “foliar gap," e; f, medullary paren- 
cayma ; g, cortical parenchyma. >< 45. 
Fı = 
ms iı 67-71. showing the different aspects of the tubular bundle m 
on, a, leaf e. ^, **foliar gap” of leaf above ; ; c, root bundles. X 11 
Fics. 72, 73. Outlines of scales. X 13. 
F 
1G. 74. The same, magnified ten times to show the cells. 
