; Karkaralong Islands, reef! St.a. i I salibabu 



.■ 

 Pacifi sland, . Herb. Mus. Brit.! Dunk Islam island, Banfield\ 



Stat. 64, 1. ui. ili Djampeah, 30 m. n° 273! Stat. 96. Pearl Bank, 



1; in.: St.it. 213. Saleyer, reef: 



n length, reaching about 15 cm. in height, much calcified. Root-ma 

 buil 5i s • > simple, usuallj short and thick. 



varying from simple, subreniform-flabellate to repeatedly, abundantly and remark- 

 sometimes zoned; usually longitudinally striato-plicate ; ashy-green, the surface 

 from smooth to minutely spumose or polyporoid in appearance; margin entire, ei 



M.iin filaments ol frond 40 -6ou in diameter, parallel, not contiguous, distromatic to 

 pluriseriate, sparingly dichotomous, very unevenly constricted above each dichotomy, bearing 

 distichously numerous short lateral branchlets of nearly equal length (about 100 — 180 ju, in 



. each constricted above the base and bearing an inflated pyriform simple or more or 

 lobed head; such heads contiguous, forming a cortex, concealing the main filaments. 



Filaments of stipes bearing long branchlets (0.5—1.0 mm.), 1 4 times dichotomously 

 branched, with very obtuse apices. [Figs. 15, 21, 22 <\ 22a?, 25a, 57 — 62]. 



forma typica. 



Plant 3 — u' cm. high. Frond subreniform-flabellate to rotundate, sometimes very proli- 

 ferous; surface very minutely and obscurely cellular to indistinctly spumose (rarely distinctly 

 spumose or polyporoid). Frond-filaments 40 — 60 ;;. in diameter, bearing lateral capitate branchlets, 

 with head distinctly and variously 2 — 6-lobcd, sometimes embossed with 2 — 9 rounded promi- 

 nences, sometimes complanately flattened and subpalmatelj lobed. Figs. 21, 22*. 220,57—60]. 



var. spumosa. 



Plant up to 15 cm. high. 23 cm. wide, with proliferations widely overlapping; surface 

 distinctly spumose or polyporoid. Frond-filaments 40 — 60 u in diameter, bearing elongate-pyri- 

 form lateral branchlets, usually simple, with apex rounded (in lower part of frond) or flattened 



or depressed (in upper part of frond). [Figs. 15. 25a, 61, 62]. 



The identity of this species was not at tirst easy to determine, owing to the disap- 



mce of Zanardini's type. All efforts to tracé this have failed, although Dr. John Bru 



most kindly searched the Delessert Herbarium in Geneva which contains many oi Zanar- 



plants, and Prof. De Toni lias also tried to tracé the plant in haly. In default then ol 



anything better, we have been compelled to depend al most entirely on Zanardini's description 



• u . and fortunately the figure of the internal structure is sufïiciently good to 



the identity of plants in the Siboga and other collections to be determined. Indeed. 



to do this satisfactorily and to separate off var. spumosa five years before we 



■ ne to »e< anj specimen oi U. argetitea from the Red Sea. Recently through 



