198 Tue Lire History OF 
center was carried by the antherozoids to which it was still at- 
tached forty-five minutes later. 
Archegonia (f. 57-60).—The few archegonia that were seen 
occupied positions similar to those of Vittaria elongata as described 
by Goebel, being borne on the under surface of the prothallium, and 
also on the small lobes among the rhizoids. The archegonia have 
a slightly curved neck, although the number of cells shown on the 
concave and convex surfaces are the same, being four or five in 
number. 
THE SPOROPHYTE 
The sporophyte generally remains attached to the gametophyte 
for some time after its formation (/ 89-97). 
RuizowE.—The main axis of the sporophyte consists of a dor- 
siventral rhizome with short internodes bearing the tufted leaves 
in two ranks, the roots are very numerous and completely clothe 
the lower surface of the rhizome. The growing portion of the 
rhizome appears as a fleshy green bulbous formation with a con- 
ical apex, completely enveloped in long brownish scales ) 56, 
39). Glands, similar to those of the leaves and hairs, resembling 
those of the root are also present. The apical cell is wedge- 
shaped and the differentiation of the tissues follows quite closely 
the advance of the apical meristem ) 67, 62). 
In the earlier stages of development of the stelar tissues they 
appear as a cylinder of thin-walled elements (7. 63) in which the 
scattered groups of protoxylem soon appear (f. 64d). The 
metaxylem next appears as a complete cylinder of scalariform 
tracheids (f. 65). The metaphloém is much more highly devel- 
oped externally to the cylinder and consists of numbers of sieve 
cells separated from the metaphloém and from the pericycle by 
parenchymatous elements. The pericycle is well defined (f. 654). 
= مهم‎ u traced upward along the stem, gaps appear 
leat (f. 66 oues of the fibrovascular ring is sent out into 
ar íi Wi eatin see pe which is composed of ex- 
somewhat thickened he ng et ber 
mis does not participate en re organo. Thé spin 
n indeed i‏ و ردو 
zomes opposite the eee ie v mbers from the 8‏ 
s and are usually quite advanced in devel- - 
