( 77 ) 



corolla, and staminodes removed ; (5) pistil figured from above to show 

 crenate bifid stigma. 



D. hirsute (6-12). (6) Male inflorescence ; (7) female inflorescence; 

 (8) polygamous group (a) female flower ; (b) male flowers ; (9) 

 monoecious group (a) female ; (b) male ; (10) fruit and calyx ; (11) 

 seeds exposed after carpellary wall removed ; (12) longitudinal section 

 of seed showing embryo. 



Plate XVI. Nat. size. 



D. Thwaitesii (1-6). (1) Male flowers; (2) female flowers; (3) 

 polygamous group (a) female (b) male flowers ; (4) monoecious state 

 (a) female (b) male cluster ; (5) fruit and calyx ; (6) young seedling. 



D. montana (7-10). (7) fruits and leaf ; (8) section through fruit 

 showing seeds and embryos in situ ; (9) male flower ; (10) female 

 inflorescence. 



Plate XVII. Nat. size. 



D. imignis (1-3). (I) Germinated seed representing a stage of the 

 seedling when the cotyledons are detached, but the epicotyledonary 

 system not liberated ; (2) a later stage showing the hypocotyl less than 

 one cm. in length and young epicotyledonary stem ; (3) an old 

 seedling showing short hypocotyl, long epicotyledonary stem with 

 rudimentary leaves along its length and a pair of large leaves at the 

 apex. 



D. Toposia. (4) Seedling showing median length for hypocotyl arid 

 long epicotyledonary stem without leaf rudiments. 



D. sylvatica (5-6). (5) young seedling ; (6) mature seedling with 

 long hypocotyl and a pair of persistent foliaceous cotyledons. Note 

 the absence of epicotyledonary leaves. 



The first pair of leaves in the seedlings of these three species are 

 approximately the same height above the ground. 



Plate XVIII. Nat. size except 6 to 8. 



D. pruriens (1-5). (1) Seed showing" embryo ; (2) young seedling : 



(3) seedling with white cotyledons attached at cotyledonary node ; 



(4) stage showing the shrivelled cotyledons after a few hours' exposure 

 and the enhanced epicotyledonary leaves ; (5) mature seedling showing 

 cotyledons detached and a scar at the cotyledonary node, an epicoty- 

 ledonary stem about one cm. in length, and the first pair of epicoty- 

 ledonary leaves as an opposite pair similar to the cotyledons of 

 D. sylvatica. 



Embryos (6-8). (&) g. crumenata (X 2) ; (7) D. Embryppterjs 

 ( X 2) ; (8) D. Ebenurn ( X 2 ) ; (9) seedling of D. Embryopteris 

 showing the pale cotyledons prior to being detached and just exposed 

 by removal of the testa and endosperm ; note the long epicotyledonary 

 hairy stem between cotyledons, (cf. fig 6, pi. XVII.) 



