90 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



Sectio III. JEugalaxaura (Dcsne) Kjellm. 



a. With broader, proportionally shorter and somewhat 

 rugose internodes 8. G. fragilis Lamk. 



b. With long, nearly eyhndric internodes 



9. G. cylindrica Solander. 



Sectio IV. Brachycladia Sonder. 



10. G. marginata (Sol.) Lamx. 



Sectio V. Vepreciilæ Kjellm. 



11. G. occidentalis n. sp. 



Sectio I. Mhodura Kjellm. 

 1. (jalaxaura comans Kjellm. 

 Kjellman, F. R., Floridé-slagtet Galaxaura, p. 44. 



This species Kjellman based upon a small, rather tiny but 

 otherwise well developed specimen collected at Guadeloupe and 

 sent to Areschoug from Crouan. 



The specimen (Fig. 95) I have gathered is large and vigorous, 

 much larger than the original one, reaching a height of about 

 12 cm. 



It is irregularly ramified with long internodes of very vari- 

 able length up to 3 cm or even more. The branches are very 

 rigid and protuberant ; their diameter, including the hairs, reaches 

 3 — 5 mm being narrowed towards the apex. The whole thallus 

 is densely covered with rigid prominent hairs and is of a dark 

 red colour. 



A transverse section shows that the medullary tissue con- 

 sists of proportionately thick filaments commonly about 20^ 

 thick, but both thinner and thicker ones are present. The peri- 

 pheral cells which bear the assimilating hairs are mostly almost 

 isodiametric often quadrangular about 50 fi broad (Fig. 96 a) ; 

 each cell commonly bearing a single assimilating filament, seldom 

 two (Fig. 96 a). The assimilating filaments consist at their base 

 of a large oval cell about 80 ^ long and 50 // broad ; then follow 

 two or three still oval cells decreasing gradually in size. The 

 rest of the filaments consists of cylindrical cells about 19// broad; 

 the length of the cells is rather variable, some are up 40 // long 

 or more, others especially in the upper end are shorter, not much 

 longer than they are broad. The whole filament reaches a length 

 of up to 1 — 2 mm. 



