J«n.. 1916.] A'. (> K AMU RA,— M Alius 1<: AUiAK. 13 



Halarachnion calcareiim n. sp. 



Diagn. : Frond membranaceous, containing calcareous sub- 

 stance in the inner tissue, irregularly lobcd, roughly dentate 

 along margin, proliferated from upper surface with small lobes 

 or provided with warty elevations or short ridges. Cystocarps 

 minute dot like scattered over surface. Substance thickish and 

 soft-gelatinous. 



On rocks in low tide. Ponape (Yanagi). 



Fronds wanting of root, probably fixed to the substratum 

 by holdfast at lower margin or based portion of frond and is 

 said bv the collector of this alga to be procumbent. Fronds 

 membranaceous, irregularly lobed, lobes roughlv and subre- 

 motely dentate along margin, proliferating from upper surface 

 simple and mostly small lobes or provided with warty or 

 sometimes a little elevated ridges or wrinkles. 



Frond internallv consists of very loosely interwoven filaments 

 enclosed with chalky substance and toward the surface the 

 filaments give rise to short dichotomous moniliform filaments 

 which form the cortical layer. Cystocarp is formed in a cavity 

 previousl}^ prepared beneath the cortex where a pore is after- 

 ward formed. At the bottom of the cavity there is a large 

 auxiliary cell which is, produced from a larger inner cortical 

 cell. In fullv formed cystocarp, the auxiliarj^ cell is connected 

 WMth cortex by some 5 or more elongated cells radiately arising 

 from the auxiliary cell and those cells embrace the neucleus 

 within. Substance thickish and soft-gelatinous. Colour pinkish. 



Chondrococcus Hornemanni (Mert.) Schmitz ; De Toni. Syll. Alg. 

 IV, p. 1674 ; Desmia coccinea Zanard. Plant. Mar. Ruhr. p. 55, n. 

 78, t. 9, f. 1. 

 Yap (Mayeda). 



Distr. : Cape of Good Hope ; Red Sea ; Mauritius Island ; Cejdon ; 

 New Holland ; Ryukyu ; Japan. 

 Amphiroa fragilissima (L.) Lam. f. cuspidata Weber v. Boss. 

 Corall. of the Siboga-Expedit. p. 90. (Determined by Mr. Ye.ndo). 

 Truk (Mivake). 

 Distr. : Indian Ocean. 

 Gelidiopsis acrocarpa (Harv.) Schmitz ; De Toni Syll. Alg. IV, p. 

 411. Truk (Mivake). 



