1JV A. II. S. LUCAS. IT") 



beyond the apica] half of the ramulus, triangularly divided, 

 rounded, large when mature, maturing in acropetal succession. 

 Cystocarps ovate-spherical, arising as modification of apex <>t' 

 ramulus, which may he terminal or lateral; producing large, pear- 

 shaped, deeply coloured spores at the extremities of the colourless 

 filaments, which radiate from a basal placenta; surrounded by a 

 cellular pericarp, with apical opening. 



Frons nana ad l"5cm. diam., ramis a disco basali divergenti 

 bus primo erectis, mox horizontaliter repentibus, compressis, hue 

 et illuc disco ad frondem hospitis atfinis. Hamuli valde patentes 

 pinnati obtusi. Tetrasporangia in superiore regione ramuli 

 immersa, triang. divisa, ampla. Cystocarpia ovato-spherica trans- 

 formatione ramuli. Color fusco-ruber, obscurior exsiccatione. 

 Substantia cartilaginea, frons chartse vix adheret. Frondes 

 gregariaj tegentes frondem hospitis. Rami primarii et ramuli 

 tetrasporangiferi uscpie ad 430//, ramuli steriles angustiores. 



This is a dwarf but typical Laurencia, In size it appears to 

 equal L. pyynnea Weber de Bosse, from Diego Garcia (Percy 

 Sladen Expedition, 1905), described in Trans. Linn. Soc. London, 

 Vol. xvi., Part 3, p.286, 1914. Our plant differs from L. pygnxea 

 in being strongly compressed, the branches spreading over the 

 Ecklonia frond almost like hoar-frost crystals on a window-pane, 

 attached by circular discs at frequent intervals. The compressed 

 branches are considerably wider than those of L. pygmcea (250/x), 

 and the tetrasporangiferous ramuli are about as wide as the 

 primary branches. L. infestans clearly belongs to the Section 

 Obtusce of the genus. 



Falkenbergia Schmitz. 



Falkknbkkoia olens, sp.nov. 



Structure of the genus. No cystocarps or tetrasporangia 

 observed. Free-floating in loose, intricate masses, more or less 

 globular, but of irregular boundary, up to 2 cm. at most in 

 diameter. Doubtful if the tangle of branches of each mass 

 belonged to one plant, or had been brought together by the 



