Ser. RhodospermE^. Para, li/iodomelacea. 



Plate LI. 



AMANSIA KUETZINGIOIDES, Harv. 



Gen. Char. Frond flat, midribbed, pinnatifid, transversely striate, mem- 

 branaceous ; the membrane formed of oblong, hexagonal cells, of 

 equal length, arranged in obliquely transverse lines or striee, destitute 

 of cortical cellules. Fructification : 1, ovate or globose ceramidia, 

 containing a tuft of pear-shaped spores ; 2, simple or branched, mar- 

 ginal or superficial sticJddia, containing ietraspores in a double row. — 

 Amansia (Lamour*), in honour of M. Amans, a French algologist. 



From plana, costata, pinnatjfida, transversini striata, membranacea ; lamina ex 

 cellulis oblongis hexahedris cequalibus oblique-transversim ordinatis confiata ; 

 cellulis cor ticalibus nullis. Fruct.: 1, ceramidia ; 2 , sticJddia marginalia v. 

 super jicialia, tetrasporas biseriatas foventia. 



Amansia Kuetzingioides ; stem cartilaginous, terete, branched; branches 

 strongly costate, bipinnatifid and proliferous from the midrib ; pinnse 

 oblong, with a slender nerve, alternately pinnatifid, the pinnules linear, 

 erecto-patent, serrate ; apices straight ; stichidia superficial, tufted, 

 linear, incurved. 



A. Kuetzingioides ; caule cartilagineo terete ranioso basi denudato sursum alato ; 

 ramis valide costatis bipinnatifidis et a costa proliferis ; pinnis oblongis tenu- 

 issime costatis alterne pinnatifidis, pinnulis linearibus argute serratis ; apicibus 

 strictis ; stickidiis superjicialibiis caespitosis linearibus hamatis. 



Kuetzingia serrata, Harv, in Trans. R. I. Acad. v. 22. p. 538 ; Alg. Austr. 

 n. 132. 



Hab. Cast ashore. Rottnest Island, Western Australia, W. H. H> 



Descr. Root unknown. Frond (probably) much branched. The stem is car- 

 tilaginous, as thick as whipcord, opaque, destitute of bordering membrane. 

 The lower part of the branches is similar, but the upper is bordered by a 

 narrow, serrated, membranous wing, and closely set with horizontally patent, 

 distichous or irregularly inserted lacinise. These lacinice are delicately 

 membranous, traversed by a very slender midrib, obliquely transversely 

 striate, and more or less deeply pinnatifid ; the younger ones are simply 

 serrate, the older incised, and the fully-developed regularly pinnatifid ; the 

 outline is oblong or obovate. The pinnules, or ultimate segments, are about 

 a line broad, and sharply serrate, minutely bifid, and quite straight (not in- 

 volute) at the apex. Under the microscope the membrane is shown to be 

 composed of hexagonal cells, about four times as long as broad, symmetri- 

 cal and of equal size, and separated by pellucid lines. The stichidia are 

 scattered on the surface of the lamina, tufted, linear-attenuate, hooked at 

 the point, and contain a double row of tetraspores. The colour is a brown- 



