108 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



f. cladostephiis J. G. Ac. (Kjellm.) 



- Spetsb. Thall. 1, p. 8; Rhodomela cladostephus J. G. Ag. Spetsb. Alg. Till. p. iS. 



ce. densa nob. 



Descr. Apbanarthron cladostephus J. G. Ag. Spetsb. Alg. Bidr. p. 8 — 9. 

 Fig. » » » » » t. 2. 



/?. distans nob. 



f. quam prior laxius ramosa, ramulis longioribus, magis distantibus. 



f. setacea nob. 



f. froode usque 15 cm. alta, fusco-purpurea, siccata subfusca; axi primario plus minus distincto, setaceo, 

 ramos breves nonnuUos, basi subattenuatos, subfalcatos et longiores vel simplices vel apice parce vel decompo- 

 sito subcorymboso-ramulosos ramulis longioribus emittente. Tab. 9, fig. 3. 



Description. As far as I know, this plant attains no more than 15 cm. in height, 

 most often less. Its main axis is scarcely thicker than a bristle, of a dark red-brown colour, 

 which in drying grows brownish with a darkish tint. It is brittle, and the younger branches 

 become flattened in drying. It is nearly corymbose in circumference. The main axis, 

 issuing from a callus radicalis, can sometimes be traced throughout the whole frond, 

 sometimes only a bit upwards, the latter condition of the plant being caused by one 

 branch-system or some branch-systems being developed above their branching-point as 

 strongly as the main axis. The elements of ramification are l:o) short branches more 

 or less sickle-shapedly incurved, tapering towards the base and the tip; these are few 

 in number; 2:o) simple, slenderly spindleshaped-cylindrical branches; 3:o) long branch- 

 systems whose main axis is most often unbranched in the greater part of its length, 

 bearing only towards the top some short, racemosely arranged, simple or scantily 

 branched secondary axes, and 4:o) long, profusely branched, fastigiatedly developed 

 branch-systems, composed of elements 2 and 3. These elements are more or less com- 

 bined into denser or thinner, fastigiatedly developed branch-systems of higher orders. 

 Reproductive organs are unknown, but it seems as if the axes of the last order and 

 the last order but one should produce tetrasporangia near their tops. In structure the 

 present form differs but little, at least when older, from the typical Rh. lycopodioides. 



f. flagellaris nob. 



f. quam prior parcius ramosa, ramis longioribus. Tab. 10, fig. 1 — 2. 



Description. The plant reminds one much of the preceding one and, no doubt, 

 stands near this. It is less tinged with brown and retains its red colour in drying. 

 The mode of ramification is the same as in the preceding form, the difference consisting 

 in the branching of f. flagellaris being less decompound than in f. setacea. The peculiar 

 aspect of the present form, is principally effected by the long branches of the last 

 order. In structure it approaches nearly to other forms, especially when these are 

 younger (fig. 1—2). 



