19^^ 



Fig. 126. The second root from the 



same, xllO. 

 Fig. 127. Horizontal section of the second, 



or elongated type of embryo, xHO. 



f, foot; r, root. 

 Fig. 128. Median section of the first 



type of embryo, after the roots have 



broken through the prothallium x'i5. 



The tracheary tissue is beginning to 



form, and the endophyte is established. 



The latter is indicated by the dotted 



area; r', r^, first and second roots; f, 



foot; pr, prothallium. 

 Fig. 129. Longitudinal section of the 



young sporophyte of O. mohiccaniDn, 

 showing the cotyledon, I, and the 

 base of the root, r, x65. 



Fig. 131. Apex of the cotyledon from 

 an older sporophyte x'275. x, the 

 apical cell. 



Fig. 132. Longitudinal section of the 

 young sporophyte of 0. moluccatium, 

 showing its relation to the pro- 

 thallium, pr; x8. 



Figs. 134, 135. Two forms of the fully 

 developed lamina of the cotyledon of 

 0. moluccanum, x5. 



PLATE XVin. 



Fig. 135. Longitudinal section of the 

 young sporophyte of 0. moluccanicm, 

 x25; 1, cotyledon; r, root; a bud, k, 

 is forming at the apex of the root,; 

 pr, prothallium. 



Fig. 136. Middle, region of the young 

 sporophyte, x65. 



Fig. 137. Bud, shown in Fig. 435, 

 xllO, r. root, apex. 



Fig. 138. Transverse section of the apex 

 of the primary root, x275. 



Fig. 139. Transvei'se sections of primary 

 root, back of the apex, xllO. 



Fig. 140. Vascular bundle of the primary 

 root, x275 



Fig. 141. Vascular bundle from the mid- 

 region, x275. 



Fig. 142. Transverse section of the 

 petiole of the cotyledon, x65. 



Fig. 143. Part of a tracheid from the 

 middle region of the sporophyte, x480. 



Fig. 144. Vascular bundle of the first 

 root of 0. pendulum, xllO; en,endo- 

 dermis. 



Fig. 145. Longitudinal section of the 

 young sporophyte of 0. moluccanum, 

 showing the adventitious bud, k, x65. 



Fig. 146. Vascular bundle of the first 

 root of the sporophyte, juct below 

 the attachment of the bud, x275. 



Fig. 147. Section of the young bud 

 associated with the root shown in 

 Fig. 146; st, stem-apex; 1, first leaf. 



Fig. 148. Transverse section of a slightly 

 older bud, showing the apical cell of 

 the stem, x. 



PLATE XIX. 



Fig. 149. Section of a bud on the first 

 root of 0. moluccanum, xlO; 1, leaf, 

 st, stem-apex; sh, sheath about the 

 stem-apex. 



Fig 150. Section of an older bud .showing 

 the first root of the bud, r', x65. 



Fig. 151. Stem-apex of the bud shown 

 in Fig. 150; xllO. 



Fig. 152. Middle region of a young 

 sporophyte of 0. moluccanum show- 

 ing two leaves, x65. 



Fig. 153. Adult sporophyte of tbe typical 

 0. moluccanum, natural size. 



Fig. 154. Small form of 0. moluc- 

 canum(V) natural size. 



Fig. 155. Two spores of the typical 0. 

 moluccanum, x480. 



Fig. 156. Sculpturing of the spore-mem- 

 brane, x950. 



Fig. 157. Two spores of the large cor- 

 date leaved 0. moluccanum (T), x480. 

 These usually are bi-nucleate. 



Fig. 158. Sculpturing of spore-membrane, 

 x950. 



Fig. 159. Veiy small spore of moluc- 

 canum (?) x480. 



