Ser. RiioDOSPEKJiEiE. Fuin. lihodumetacece. 



Plate CCXXXV. 



LENORMANDIA MARGINATA, ///. ei if. 



Gen. Char. Frond leaf-like, proliferous. Thyllodla flat, membranaceous, 

 undivided, midribbed, obliquely cross-striate, internally honeycombed 

 with rhomboidal cavities; the surface-cells minute. Fructification 

 of both kinds scattered over the surface : the 1st, ovate, pedicellate 

 ceramidia, containing pear-shaped spores; the 2nd, lanceolate sticJd- 

 d'la, containing tripartite tetraspores. — Lexormandia [Sond.), in 

 honour of M. Rene Lenormand, of Vire, Calvados, a distinguished 

 French algologist. 



Frons foliacea, prolifera. Thyllodla plana, memhranacea, indlvim, cosiata, de- 

 CKSsaiim striata ; celluUs intimis magnis lacunosis oblique ordinatis, extimis 

 7nimitis inordinatis. Fruct. utrinsque generis sparsns : 1, ceramidia pedicel' 

 lata, sporas pgriformes foventia ; 2, slicJiidia projjria, lanceolata, tetrasporas 

 triangule divisas contineutia. 



Lenormandia marginata ; phyllodia thinly membranous, broadly linear- 

 oblong, very obtuse, suberaarginate, ciliate, proliferous from the mar- 

 gin and the surface ; ceramidia and stichidia mostly marginal ; nerve 



slender. 



t 



L. marginata ; phyllodiis tenui-memhranaceis lato-lineaii-oblongis obtusissimis 

 subeniarginatis ciliatis, e margine limboque proliferis ; ceramidiis sticJiidiisque 

 Sfepissime margin alib us ; tiervo teniii. 

 Lenormandia marginata, Ner. Ansfr. p. 19. t. 2. Kiitz. 8p. Jig. p. 849. 

 Hook. Fl. Tasm. v. 2. p. 295. Harv. Alg. Exsic. Austr. n. 129. 



IIab. Abundant in the Tamar, at Georgetown, Tasmania, F. Gunn, 

 IF. H. H., etc. 



Geogr. Distr. Tasmania. 



Descr. Frond 6-10 inches lono:, and fully as much in the expansion of the pro- 

 liferous branches ov phyllodia. The primary phyllodia are 3-5 inches long, 

 i-1 inch wide, obtuse at each extremity, and of an exactly oblotig figure, 

 more or less obviously emarginate at the extremity, traversed by a very 

 slender (sometimes oh'solete) midrib, and bordered with more or less almn- 

 dant ciliary processes, which are rarely absent. The secondary and tertiary 

 phyllodia, of lesser size but similar shape, spring in the first instance from 

 the margin of the older ones, consequently the normal couflitioii of the frond 

 is pinnate ; but in older fronds, besides these marginal pliyllodia, there are 

 often many more, arising from the disc and spreading in all directions. 

 Such fronds hccome almost globose, as if a fascicle of leaves grew in a dis- 

 orderly manner from a common centre. The surface or disc of the phyl- 

 lodia is commonly quite smooth and naked, marked wUh faint decussating 



