1917] BRYAN—ARCHEGONIUM OF CATHARINEA 3 
8. The terminal cell adds to the growth of the neck by segments cut 
from its 3 lateral faces, and to the growth of the axial row by segments cut 
soe its truncate face. 
Growth in length of the archegonium neck is intercalary as well as 
wie in both neck and canal.rows. 
SERVETTAZ (13) in a quite recent physiological paper on the 
Musci includes an investigation of the development of Phascum 
cuspidatum. ‘The developmental story is given briefly as follows 
(p. 271): 
La cellule initiale se cloisonne transversalment et donne une cellule de 
peid, “‘a,’”’ et une cellule supérieure ‘‘b’’; la cellule ““b”’ se cloisonne ensuite 
obliquement un certain nombre de fois (2-5) comme s’il s’agissait de consti- 
tuer un bourgeon végétatif ordinaire, puis l’une des cellules placées au-dessous 
de la cellule terminale se divise tangentiellement et détermine la formation 
d’une cellule central “‘c” qui, par des cloisonnements basipétes, donne une 
file de 8 cellules qui seront: 1-4, les cellules du canal; 5, la cellule du ventre; 
6, Poosphere. ... 
Quant 4 la cellule terminale, ey s,” elle peut continuer A se diviser et elle 
forme la calotte recouvrant l’extrémité du col. 
En definitive, le mode de formation que nous venons de décie se rap- 
proche de celui que Goebel a décrit pour Mnium undulatum. 
_ The evidence offered in support of this developmental story is 
_ Certainly too meager and not sufficiently critical to be convincing. 
- Moreover, the origin of the central cell, or first cell of the axial row, __ 
_ by a tangential division of one of the segments below the terminal 
cot f is a k revival of the HOFMEISTER Conception: which mpegs ao 
"nw oem @) dapemansasnaatan the archegonium ; 
of S Te sections both transverse CS a 
cle) Wicca Hide ‘had of the other Musci ce 
