Butters: li agora and galaxauka. 169. 



upper einl of eacli cell. Thev average 28 niic. in diameter. The 

 jiroportion of .smaller mechillary filaments varies in different speci- 

 mens. The medulla, at first small, may come eventually to occupy 

 rather more than half the diameter of the frond. The cortical 

 branchlets are borne on the larger medullary filaments or in some 

 cases on the successive nodes of comparatively short lateral branches 

 of the larger filaments. The cortical branchlets are characterized 

 by the elongated cylindrical cells of the median portion (8x40 mic), 

 becoming somewhat shorter and more ovate above and by the 

 abrupt terminal corymbs of short oval cells, the distal cell being 

 almost spherical, 8-10 mic. in diameter. At the apex of each branch 

 of the frond the cortical branches form a dense pulvinate conical 

 mass. Elsewhere they but loosely cover the medullary cylinder. 

 Apparently a variable species, varying in the amount and hardness 

 of the incrustation and to some extent in the structure of the cen- 

 tral cylinder. The extremes would doubtless be considered sepa- 

 rate species but there are numerous intergrading forms. It appears 

 to be closely allied to L. tenuis and L. leprosa. The irregularly di- 

 chotomous branching, the prominence of the cystocarp and the 

 form of the cortical branchlets are constant. 



Liagora hawaiiana sp. nov. 



PLATE XXIV. FIG. 8, 9. 



Fronde anguHs acutis dichotoma ex basi parva rotundata dense 

 decomposita, ramis multis articulis longis in diametro subaequalibus 

 ad .8 mm. latis instructa strato calcis leve incrustata punctis multis 

 decalcaratis minutis et in basibus articulorum singularum annulis 

 decalcaratis interrupto, apicibus ramorum perobtusis decalcaratis ; 

 strato intimo firmo, in partibus frondis junioribus angusto, in diam- 

 etro longitudine filorum corticalium minore filis cellulorum latiorum 

 composita in partibus frondis vetustioribus latiore in diametro longi- 

 tudine filorum corticalium duplo aut triplo superante ; ramulis cor- 

 ticalibus libris dichotomis cellulis infimis cylindraceis qui fila angus- 

 tissima lateralia in stratum intimum redeuntia ferunt cellulis su- 

 premis 3-5 ovalibus corymbum dichotomum subiter facientibus ; 

 frondibus dioecis, cystocarpiis plurimis ramulis dichotomis copiose 

 involucratis, antheridiis ut in L. leprosa, pernumerosis. 



On reef at low tide. Laie point, Koolauloa, Oahu. June 16, 

 1900. (J. E. T. 1005.) 



