134 ( 0LLIN8 AND III i;\ \ \ . 



duced by the lowest cell of an erect filament The plant grew on 

 the top of sand-covered rock-, covered at high tide; tin- coral -and 

 .sifted in among the alga, forming a dense fibrous mass. 



( i 1: wimi ii \\i\i,.\ Richards. 



C. Codd Richards, 1901, p. 264, PI. XXI; I'. B.-A., No. 18 

 Plate III, fig. '22: plate IV. fig, 2 I ommon on ('minim tomentosum 

 and other species <»t' ('odium all about the islands, at all times <>t" the 



year, almost always in abundant fruit It was once found on Latin n- 



rrii-nrni.s-. A few note- can he added to the quite full description 

 of Richards. He observed only a single ripe tetrasporangium at a 



node; we have found not uncommonly two, rarely three, in one 



instance four, of apparently equal age, side by side; branches occa- 

 sionally occur independently of the polyspores; we have found organs 



quite agreeing with his figures of the latter, hut also similar organs, 

 larger, up to l*>o^ diam., spherical, containing up to r> spores, and in 

 appearance quite indistinguishable from cystocarps of CeramiurrL" 

 inst the identification of these organs rtocarps must be 



reckoned our failure to discover anything like procarps, and the 

 question must he left open. The rhizoids offer some interesting 

 peculiarities, doubtless due to adaptation to their position, between 

 the closely-packed utricles of the host; at first terete, they soon 

 become flattened, and often two or more unite laterally, in a mem- 

 branous expansion, which may he as much a- 10 cells wide. In one 

 case three rhizoids from one individual united with two from another 

 to form one membrane. The cross walls in these rhizoidal membranes 

 arc often much oblique, and the arrangement of the cells reminds one 

 somewhat of that in the leaf of a moss. See Figures 22 and 

 The material from which this species was described was collected in 

 Bermuda in 1898 and 1899; the only other record of it- occum 

 is at Barbados, Vickers, 1905, p. <>">. 



Grifftthsla Agardh. 



1. Vegetative cells cylindrical throughout. 1. G. tenuis. 



l. Lower cells subcylindrical, upper ovoid. 2. G. Schousboei. 



1. All cells Bubspherical. ' ■• monilis. 



17 Schiller, 1913, has made extensive observations on organs of this char- 

 acter in genera allied to Ceramothamnion, and he reports tna1 in ever] 

 they were accompanied by tetraspores of normal character <>n the Bame 



individual. This is not the case with tin- speci 



