MARINE ALGAE I i;n.\l EASTER ISLAND 



291 



Coralline, 

 Amphiroa Lamx. 



A. fragilissima (L.) Lamx. 



Lamouroux, I. V. lv. Hist. Polyp, ilex.. Caen 1816, p. 298. A eschoug, J. E. 

 in J. Agardh, Spec. I. 2, pars r, p. 531. Weber van Bosse, A. and M. 



IE, Corallin. of the Siboga-Exped., p. 89, pi. 16, figs. 1, 2, 5. — Cor allina fragi- 

 lissima L, System, nat., ed. 12, vol. r, p. 1305. 



f. fragilissima (Lamx.) Weber- van Bosse, 1. c. A slender form in which 

 the nodes are not much swollen. In the central strand are mostly 3, sometimes 

 only two rows of long cells between each row of short cells. The long cells 

 measure about 55 ;j.. 



Area of distribution: West Indies, Pacific and Indian Oceans. 



A. Yendloi nov. spec. — Fig. 33. 



Thallus caespitosus e disco basali piano et filis erectis compositus. Discus 

 basalis expansus substrato adhaerens. 



E disco surgunt fila erecta, teretia, 250 — 300 ;j. lata, simplicia (raro subdi- 

 chotomo) et leviter regulariter constricta, articulata. 



Singuli articuli plerunique ternas interdum plures constrictiones amplec- 

 tuntur. 



Articuli strato corticali tecti, nodi nudi; cortex e cellulis subrotundis in 

 series breves ex parte interiori ortus. 



Stratum thalli inerioris e cellulis diversae longitudinis compositum est, 

 1) brevibus, 2) sublongis, 3) longis; hae in zonas transversales ordinatae regu- 

 lariter alternant. 



Sfei«*."2:S- ■■■■ u 



Fig. 33. Amphiroa Yendoi nov. spec, a Habit of plant, 3 /> ; b part of thallus, c. 6 ' 1: c length 



section, c. 1S0 /i. 



