180 MINNESOTA BOTANICAL STUDIES. 



Section VI. Brachycladia Sonder. Linnaea. 314. 1853. 



Galaxaura arborea Kjellm. Om Floride-Slii^tet. Galaxaura. 

 72. 1900. 



Stalk very stout, elongated, attenuate towards the apex, above 

 fasciculately or subverticillately branched ; leaves shortly dilated, 

 widely obovate, several times pinnate furcate, thickish. whitish, 

 with internodes 2-3 mm. wide, barely more than 3 mm. long, with 

 assimilatory filaments having almost always a unicellular pedicel ; 

 terminal cells commonly cylindraceous-elliptical, 40-48 mic. long, 

 24-36 mic. wide. 



Laysan Island. May 21, 1902. 16 fathoms. S. Co. (U. S. 

 Fish Com. 3962.) Bird Island. June 3, 1902. 32-46 fathoms. 

 S. For. R. (U. S. Fish Com. 3978.) Bird Island. August 8, 1902. 

 40-36 fathoms. Co. S. P. Sh. (U. S. Fish Com. 4164.) 



In some plants in this material the stalk is comparatively short 

 and branched almost at the base, while in other plants it is as long 

 as Kjellman's description indicates. This difference appears to be 

 entirely a matter of individual variation. 



Galaxaura acuminata K J ELL^rA.Y in ATss. 

 PLATE XXTV. FIG. 17-19. 



Fronde ad 8 cm. alta paniculata e caudice brevissimo prolifica- 

 tionibus plurimis iteratim laxe furcatis teretibus aut superne sub- 

 complanatis, inferne subglabra sed filis rectis paucissimis sparsis aut 

 subverticillatim dispositis instructa, superne fere glabra transversim 

 striata ; tela assimilatoria filis curtis plerunique cellulis ternis com- 

 positis cellula pro.xima singula ultimas binas fereute ellipsoideas 

 saepe breviter apiculatas 30-33 mic. longas, 13-23 mic. crassas (rare 

 majores) chromatophoro hemisphaerico valido praeditas instructa. 



W^aianae, Oahu. May 22. 1900. (J. E. T. 821.) Type speci- 

 men. 



On sides of shaded rocks at half tide. Oahu. (J. E. T. 1084.) 



Specimens from the type collection were determined by K jell- 

 man in 1902 as being a new species to which, in a letter, he assign- 

 ed the name Galaxaura acuminata. This species has, however, 

 never been published. The description given above is from mater- 

 ial of the same collection now in the Botanical Department of the 

 University of Minnesota. The stalk of the frond is short and 

 bears many proliferations, each of which is many times dichoto- 



