APPENDIX. 
n 7 
to Professor Bower* apogamy and apospory undoubtedly occur 
simultaneously in Trichomanes alatum. Finally, 1 may add 
that the Fern before you has not been in any way stimulated 
by abnormal warmth, but developed its peculiarities in a- close 
but cold Wardian case. 
Young frond of Lastrea Pseudo-mas, var. cristata, bearing 
APOSPOROUS PROTHAELI. (NATURAE SIZE f INCH.) 
a. Terminal prothallus, with profuse root-hairs at hack ; b. Incipient 
cushion ; c. Pinna-tip bearing root-hairs, without any defined prothallus ; 
pr. Marginal prothalli; rh. Root-hairs; d. Stump of primary frond, 
apparently eaten off ; e. Third frond unfolding. 
* “Annals of Botany,” vol. i., p. 300, pi. xvi., fig. 35, &c. 
