314 BOTANICAL GAZETTE 
first wall to form is the basal wall, separating, as in Pteris, a 
smaller laterally-placed epibasal hemisphere from a larger hypo- 
basal. In fig. 9 the orientation is indicated as described, and the 
further development of the hemispheres, as in the case of Pteris, 
is too well known to need any extended description. 
Embryogeny of Lycopodium.— For many years the sole investi- 
gated lycopodineous embryo was that of Selaginella so ably 
studied by Pfeffer, 75 but in 1884 Treub” presented the first fig- 
ure of an embryonic Lycopodium plant, something which had 
been diligently looked for during many previous years. In this 
first paper the account was incomplete, but two years _ 
Treub?? was able to announce most of the stages in the embry: 
ogeny of Lycopodium phlegmaria. Confirmation of Treubs 
researches was given within a year by Goebel,” who, sage 
does not figure any young stages of the embryos studied " 
him, his sketch of the young plant of Lycopodium inandaten 
being about as far along in development as was Treub’s 7 
dium cernuum embryo of his 1884 contribution. From the bri 
liant investigations of Treub and Pfeffer in particular the ee 
ogeny of the Lycopodine may now be said to Me — 
known, although as for so many other groups the — 
here was really laid by Hofmeister, 7? who figured as i Sa 
1851 a two-celled embryo of Selaginella denticulata, and s : ‘ 
the peculiar suspensor in its proper relation to n A ak 
embryo. In Lycopodium, more instructive than inet 
because its prothallium is less vestigial, the archegones ae 
regarded as dorsal, and the egg within the archegone ; is, 
perpendicularly to the archegone axis, as in ES oe 
however, the hemisphere towards the base of the ar o 
** Die Entwickelungs. des Keimes der Gattung Selaginella. i 
4232. 1671. . 129. 1884+ 
* Etudes sur les Lycopodiacees. Ann. Jard. Buitenzorg 4° ae 886. : 
77 Etudes sur les Lycopodiacees. Ann. Jard. Buitenzorg 5: ae Bot. Ze 
7° Ueber Prothallium und Keimpflanzen von Lycopodium vase 
45:14. 1887. 
* Vergleich. Unters. 
