92 



2. Galaxaura subvcrticillata Kjellm. 

 KJELLMAN, F. R., Flo-ride-slagtet Galaxaura, p. 48. 



This species has been described 

 from specimens which 0RSTED col- 

 lected at St. Croix and sent to ARE- 

 SCHOUG. In the Botanical Museum, 

 Copenhagen, some more specimens 

 of 0RSTED's from St. Croix are to 

 be found which quite agree with the 

 specimens determined by KJELLMAN. 

 The specimens I have collected 

 (compare Fig. 97) seem to agree very 

 well with the original examples. In 

 this species both long and short assi- 

 milating filaments are present and 

 the most striking character is the 

 verticillate arrangement of the fila- 

 ments. This annular arrangement is 

 most clearly present in the young 

 parts of the thallus, in the older 

 ones the long hairs occur in a more 

 scattered manner over the whole sur- 

 face and some specimens are even 

 found in which the annular arrange- 

 ment is much reduced, the specimens 

 having an almost even but rather open 

 covering of hairs over the whole sur- 

 face. KJELLMAN explains this fact by 

 considering that the short hairs later on 

 grow out more or less into long ones. 

 The surface of the thallus, espe- 

 cially in that of the upper young ends, 

 is rugose and often clearly annulated. 

 The internodes are nearly cylin- 

 drical, mostly constricted at the base, 

 of variable length but usually short 

 seldom exceeding 1 cm. 



The colour of my specimens was 



greyish olive-green with a reddish tinge especially in the younger 

 parts of the thallus. 



A transverse section shows the medullary tissue to consist of 

 the usual, rather thick walled, cylindric cells woven together. The 



Fig. 96. Galaxaura comans 

 Kjellm. a, basal parts of as- 

 similating filaments with the 

 supporting cell, b, base of 

 a ramified filament. (About 

 150:1). 



Fig. 97. Galaxaura subver- 



ticillatal\]Q\\m. Part of the 



thallus. (About 1,5 : 1). 



