178 MINNESOTA BOTANICAL STUDIES. 



parenchymatous layer spherical or higher than wide, varying con- 

 siderably in size, but averaging about 24 mic. in width, the super- 

 ficial cells about 18 mic. in diameter, almost spherical, or higher 

 than wide. The elongated peripheral filaments are 17-18 mic. in 

 diameter and seldom exceed 200 mic. in length. Rhizoid-like fila- 

 ments occur but are rare. The joints at the base of the prolifera- 

 tions are very short. The peripheral filaments at the base of one 

 of these joints are elongated, cylindrical filaments resembling those 

 of the internode. Above occur shorter filaments, often branched, 

 with clavate ends, the terminal cell about 30 mic. in diameter and 

 then yet shorter filaments with the two upper cells tumid, from 

 which the transition is rapid to the ordinary sub-parenchymatous 

 peripheral layer. 



Heller's specimen is a somewhat larger plant than the above, 

 about 5 cm. high, and with internodes up to 6 mm. long and 1.5 

 mm. wide. In mode of branching and structure it agrees with the 

 above. 



No. 3834 U. S. Fish Com. agrees with the above in structure, 

 but dififers in color, being whitish, and is less regularly branched, 

 many of the proliferations being striated and the whole specimen 

 having the aspect of a plant which has grown under unfavorable 

 conditions. 



Galaxaura cuculligeraKjELLM. (?) Om Floride-Slagtet Galax- 

 aura. 58. 1900. 



Frond umbellate, with proliferations which are very short, stip- 

 itate, more or less densely forked, at first glabrous, smooth or dense- 

 ly rugulose, membranaceous, collapsing, with the lowest internode 

 cucullate, afterwards densely villous, solid, distended, heavily im- 

 pregnated with lime, subcylindraceous, with almost inconspicuous 

 joints ; elongated peripheral filaments persistent, not arranged in 

 any conspicuous order, often branched, the branches either similar, 

 strict, sub-attentuated, short, or one branch strict, the other rhizoid- 

 like, much elongated. 



Waianae, Oahu. May 22, 1900. (J. E. T. 821 B.) 

 A single plant agreeing with the description of this species ex- 

 cept that the peripheral filaments are strict, simple. Often, how- 

 ever, two are borne side by side on the same subepidermal cell, 

 giving somewhat the appearance of a forked filament. 



