﻿PLATE VII. 



Hypoglossum barbatuni Sp. Nov. 



DEI_ESSERIACE>€. 



Norn, Jap, Hige-beniha-nori. 



Diagn ： Frond perhaps decumbent, narrow, linear- lanceolate, 

 tapering to both ends, branching by repeatedly proliferating similar 

 segments from the midrib on both surfaces. Proliferations alter- 

 nate, but sometimes take apparently opposite arrangement. Midrib 

 slender, jointed at short intervals, consisting of ecorticated three 

 oblong cells, and destitute of veins. Marginal cells irregularly 

 reticulated and give rise to root-like, jointed, simple or branched, 

 fibres by fusion of two or more cells. Sori oblong, borne on 

 the midrib. Cystocarps unknown. 



hab. Hiuga. 



Descr. Only one small specimen has been found among 

 marine detritus. The plant seems to grow at first decumbent 

 and subsequently erect, judging from the presence of marginal 

 root-like fibres. The frond is linear-lanceolate, destitute of veins, 

 tapering towards both ends. From the midrib of the primary 

 frond repeatedly spring the leaflets of similar form, and their 

 midrib emits others ； the plant thus branches out by repeated 

 proliferous growths from both surfaces, and the older portion 

 seems to disappear, as the basal extremity of the frond is rounded 

 and furnished with secondarily formed root-fibres (Fig. 6). The 

 proliferations are single along the midrib, but here and there two 

 of them grow so as to appear to oppose one another at the 

 same point. This apparently opposite arragement of leaflets, 



