Developments of the Oophyte in Trichomanes . 305 
Fig. 46. Antheridium seen somewhat obliquely from without, x, lenticular 
cell (apical cell?) which has turned brown, x 175. 
Fig. 47. A, C, young antheridia in optical section. B, young antheridium 
seen from above, x 175. 
Fig. 48. A, B, young antheridium, external view from opposite sides, x 1 75. 
Fig. 49. Young antheridium, external view, x 7 °- 
Fig. 50. Antheridium in optical section, x 175. 
Fig. 51. Flattened prothallus, pr, with sterigmata, st, at apex: laterally is 
borne an apogamous sporophyte with first leaf, /, root, r. x 3. 
Fig. 52. An apogamous bud borne on filament growing out from the margin of 
a flattened prothallus. x 36. 
Fig. 53. ditto, x 70. 
Fig. 54. Apogamous bud inserted with broad base on the margin of a flattened 
prothallus. x 70. 
Fig. 55. A flattened expansion showing in its lower part the characteristics of a 
flattened prothallus, but acquiring gradually in its upper part the characters of a 
sporophytic leaf with median vascular bundle, v. b., and branched conical hairs at 
the apex, x 3. 
Fig. 56. A specimen similar to the above : on the protonema at the base, pr , is 
an antheridium, a ; rhizoids, rh> are formed laterally at the base; towards the 
apex are the characteristic branched conical hairs, h , and the median vascular 
bundle, v. b., of the sporophyte ; on the surface is formed a sporophytic bud, b, 
from which a short vascular strand, v. b., runs down for a short distance towards 
the base, x 3. 
Fig. 57. Longitudinal section through that same bud, showing how the tissue of 
the bud is continuous with the tissue of the flattened expansion, and how the 
tracheides, tr, of the vascular bundle run from the one to the other, h , the 
characteristic hairs of the sporophyte. x 35. 
