176 MINNESOTA P.OTANICAL STUDIES. 



and about 3 times as long, sub-distended, upj^er up to 10 mm. long. 



often shorter, obcon-ellipsoid, collapsing. 



Hanalei, Kauai. July 26. 1900. (J. E. T. 1239 B.) 



Some small fragments, the largest 4.5 cm. long The long 



peripheral filaments are very scarce except on a few stunted lower 



branches where they are numerous. 



Galaxaura hawaiiana sp. nov. 



PLATE XXIV. FIG. 16. 

 Fronde ad 5 cm. alta, laxe furcata, e basi crassiuscula, deinde 

 decomposita subdivaricata proliferationibus sparsis instructa ; inter- 

 nodis variis nunc brevibus nunc longis ad 1 mm. crassis parum seu 

 nihil rugulosis articulis baud conspicuis ; internodis infernis pilosis 

 obconicis distentis, superis glabris elongatis cylindraceis seu fusi- 

 formibus membranaceis facile coUabentibus ; tela assimilatoria sub- 

 parenchymata cellulis strato triplice seu quadruplici facta intimis 

 magnis. crassis, saepe bi- seu trilobis mediis sphaericis minoribus 

 extimis aut obconicis aut lenticularibus cohaerentibus fila periphaer- 

 ica elongata in partibus frondis vetustioribus plura fragilia haec 

 erecta stricta ad 300 mic. longa ilia longiora rhizoidea saepe ramosa 

 ferentibus. 



French Frigate Shoal. May 29, 1902. 14-16 fathoms. S. Co. 

 (U. S. Fish Com. 3968) ; Bird Island. August 5. 1902. 26 fath- 

 oms. Co. Corln. (U. S. Fish Com. 4147.) 



The appearance of the frond is characteristic on account of the 

 elongated, usually tapering, terminal internodes and the frequent 

 occurrence of several very short internodes close together below 

 which, with the divaricate branching often produces an umbellate 

 appearance. 



The parenchymatous layer is very lax. appearing in the younger 

 internodes almost filamentous, so that these younger parts of the 

 frond, when the elongated epidermal filaments have not yet de- 

 veloped, might be mistaken for parts of some Eu-Galaxaura. In 

 the older parts of the frond (10 mm. or more from the growing 

 point) the parenchyma is somewhat firmer and the development 

 of the long epidermal filaments produces the characteristic Micro- 

 thoe structure. In the parenchymatous area the inner cells are 

 broad, often two or three-lobed, the unlobed cells about spherical, 

 ,30-50 mic. in diameter, the lobed up to 100 mic. wide. The inter- 

 mediate cells of the parenchymatous layer are smaller, about spher- 



