﻿PLATE XXX. 



Rhipidiphyllon reticulatum (Ask.) Heydr. 



VALONiACE/E. 



Nom. Jap. Ami-moyo. 



Rhipicliph)"llon reticulatum (Askenasy) Heydrich Beitr. zur Kenntniss 

 der Algenflora von Ost-Asien p. 28 r, Taf. XV. Fig. 1. (Hedwigia Bd. 

 XXXIII. 1894). — Anadyomene reticulata Askenasy Forsdmngsrcisc S. 3L 

 S. „ Gazelle.' 1 Bot. IV. Th. Algcn. pag. 5 ； De Toni Syll. Alg. Vol. I. 

 P- 731. 



Plants form a rosette-like tuft composing of fan-shaped, 

 radially folded or undulated, leaf-like nets, 3-4 cm. in extent. 

 Net is constructed of repeatedly palmate and radially arranged, 

 cylindrical cells which form tlie main veins of leaf. From almost 

 every " node of these veins, arise smaller cells which loosely 

 anastomose to each other by means of the formation of terminal 

 tenacula, forming angular meshes between. The size of meshes 

 of the upper portion of frond is s trailer than the lower, and it 

 gradually diminishes as it proceeds upwards. Intercalary division 

 of cells is often perceptible in those of main veins. Lower cells 

 of the main veins are much elongated, their lengths being 5-6 

 times or more, while the upper ones are 2-3 times long as 

 broad. Lengths of cells of the " veinlets (if we may call those 

 cells which arise from the main veins) are mostly subequal to or 

 twice as broad. Tenacula have no such crenulatecl structure as 

 it is usual to DictyospJiceria, Boodlea, Valdnia etc., but, here, 

 the terminal wall of cells which are brought into contact with 



