Butters: liacora and galaxaura. 171 



is based may correspond witli either of the species in my collection 

 or may be distinct from both of them. 



Liagora corymbosa J. Ag. (?) Anal. Algol. 3:104. 1896. De 

 Toni. Syll. Alg. 4 :93. 1897. 



PLATE XXTV. FIG. 10. 



Frond terete, on drying complanate below, somewhat terete 

 above, dichotomous, appearing corymbose and with lateral prolif- 

 erations below the corymb, apices subdivergent, the whole covered 

 with a mealy incrustation interspersed with naked branchlets pro- 

 truding beyond the crust, with the filaments of the fascicles coher- 

 ing in torn series in softened material. 



Waianae, Oahu. June 12. 1900. (J. E. T. 1564 C.) 



Small specimens about 5 cm. high, somewhat stout, 1.5 mm. 

 thick, dichotomously branched at somewhat long intervals and with 

 numerous lateral proliferations. The frond has the general texture 

 and appearance of L. cheyneana. The cortical branchlets have, 

 however, the structure found in the sub-genus Eu-Liagora. These 

 often arise in pretty regular order giving the frond a somewhat 

 regular annular appearance. Below they are narrow, dichotomous 

 at long intervals, often with somewhat open angles between the 

 branches. The first dichotomy usually occurs at the summit of the 

 basal cell of the filament. Above the branchlets are di- or trichoto- 

 mous forming a fascicle of short spreading branchlets. The ter- 

 minal cells are almost spherical, smaller than the penultimate cells, 

 5-8 mic. in diameter and in young branchlets are armed with setae 

 similar to those described under L. cheyneana. The cortical branch- 

 lets are often 600 mic. in length. This fact, together with the 

 spreading tips, and very slender and sparingly branched lower por- 

 tions gives them a characteristic aspect. Cystocarps occur of the 

 generic structure with a somewhat abundant involucre, resembling 

 the vegetative cortical branchlets. 



Liagora Tildenii sp. nov. 



PLATE XXIV. FIG. 11, 12. 



Fronde irregulariter dichotoma sed quasi subpinnatim panicu- 

 lata multis cum proliferationibus brevibus ex ramis maximis exori- 

 entibus instructa, tereti, 3-5 cm. alta, ad basin 1.5 mm. lata, crusta 

 calcis pulverulente prope ad apices ramorum tecta ; strato axile in 

 ramis junioribus perangusto, cellulis magnis per compressionem 

 reciprocam nonnihil irregularibus instructo, in ramis vetustioribus, 



