250 BOTANICAL GAZETTE [ocrones 
arise simultaneously nor are they separated by a wall parallel to 
the longer axis of the basal cell, it is evident that the branching 
of the filaments is strictly monopodial (P/. XXT, figs. 26, 32, 35). 
The upper cells of the plantlet soon cut off pericentral cells, 
and at the same period the first rhizoid divides repeatedly so as 
to form a multicellular, monosiphonous filament (Pl. XXI, fig. 
28, as): Secondary rhizoids are next developed, either as out- 
growths from the primary root-cell or from a pericentral cell imme- 
diately above the basal cell (P/. XXTJ, fig. 31). Long slender 
rhizoids may be formed before a clasping-disk arises, but, both ia 
plantlets developing in the laboratory (2. XXT, figs. 29, 33,36) 
and in those growing in a state of nature (Pl. XXY, figs. 30,34 
_ 39, 40), the primary rhizoid generally remains very short and by 
means of oblique walls produces discoid holdfasts at the tip 
The size and efficiency of this holdfast are increased by meals 
of free secondary rhizoids (P/. XXT, fig. 33) or by intracuticula 
filaments (P?. XXT, fig. 34), both of which have their ongin ® 
pericentral cells near the base of the plantlet. The secondary 
rhizoids develop in the same manner as the primary and vote 
bine with them to form a large, irregular, discoid holdfast, ® 
which it is possible to distinguish few of the component a 
ments (P/. XX/, fig. 37). The mature holdfast, though adhering 
closely to its host, does not penetrate it, but a cutin 
the cortical layers often results from the contact. As in Lomen 
taria, etc., the large holdfast gives rise to several 
branches; and great powers of vegetative f 
implied by the stores of floridean starch with 
are often charged. The chromatophores are closely a 
er radial 
in the peripheral protoplasm, especially next to the ine eres 
and the lateral walls, and often indicate the plane ee wee 
scold, 
wall will soon be formed. They are large and 5 
resembling those of the cortical cells of the frond f 
the anastomosing filamentous chromatophores of the a ia 
Very different from the short, multicellular, Phe Pol 
oids of the Chondriez are the primary holdfasts of oup is 
siphoniee, The form taken as a type of the satel 
ather that 
tral cells 
ir : 
a 
ization of 
adventitious — 
eproduction use 
which the cells 
geregates 
‘i 
y 
= 
i 
: 
? 
7] 
