Butters: liagora and galaxaura. 183 



eter, which rises from an enlarged base. The branches of the 

 trnnk bear tliin, forked leaves. The segments of the leaves are 

 about .5 mm. thick, 2 mm. wide, 4-12 mm. long, cuneate or linear- 

 cuneate. The "leaves" are distinctly thickened along the margins 

 and are very faintly transversely zonate towards their outer ends. 

 The trunk is solid cylindrical, slightly limy throughout, its periph- 

 eral layer consisting of short free filaments with their outer cells 

 swollen, about 30 mic. in diameter. The leaf consists within 

 of loosely interwoven filaments. The assimilatory layer consists 

 of thin layers of cells. The innermost layer consists of large cells 

 broader than high. The middle layer is made up of somewhat 

 larger cells, often lobed, and when not lobed higher than broad. 

 The outermost layer consists of small flattened cells about 25 mic. 

 in diameter, those on the margin of the leaf bearing each a single 

 clavate, cylindrical, apiculate papilla 40-45 mic. long, about 14 mic. 

 wide above. 



The greater size of the cortical papillae, their distribution, and 

 the absence of elongated cortical filaments in the region of the stipe, 

 appear to distinguish it from the species as described by Kjellman. 



Galaxaura infirma Kjellm. Om Floride-Slagtet. Galaxaura. 

 81. 1900. 



Frutescent; frond loose, forked, with the internodes often evi- 

 dently contracted at the base, scarcely more than 1.5 mm. wide, with 

 close set superficial papillae, subclavate cylindrical, rounded or often 

 acutish at the apex, not rarely short-mucronate, 25-30 mic. long, 

 about 18 mic. wide. 



On rocks at half tide. 



Waianae, Oahu. May 22, 1900. (J. E. T. 820.) 



Det. by Kjellm. 



Kealia beach, Kauai. July 25, 1900. (J. E. T. 1178.) 



Galaxaura sp. 



PLATE XXIV. FIG. 21. 

 A form apparently intermediate between G. infirina and G. ve- 

 preciila Kjellm. It is more loosely branched than the above and 

 has thinner and wider branches with the internodes distinctly con- 

 tracted and jointed at the base. The outer cells of the assimilatory 

 area are subhemispherical, not so much flattened as in G. infirma, 



