6 



One has very much elongated, linear, band-shaped frond and it 

 branches in an irregularly dichotomous manner, having the net-work 

 on apical portions of branches whose continuous (not net-worked) 

 portion and the upper margin of the net-work are serrated (PI. LIII, 

 fio-. 3). The other one develops secondary net-works on the lobes 

 of primary marginal membrane which grow up into cuneate 

 segments (Id., fig. 4.) 



I took the linear form referred to for an extremely abnormal 

 form of some species of ftfarteiisia and the alternately net-worked 

 one for either J\I. denticulata or M. pctvonia. Recently, N. Svedelius 

 made a full study on the plants of this genus, and in his work, it is 

 stated that HI. denticulata has the aforesaid continuous portion 

 developed in the highest degree of all species, and from that character 

 I think both forms in question to be J/. denticulata. But, at present, 

 as the materials are only fragmental, I leave the matter for my 

 further stud)'. 



PL. LIII. Fig. 1 : frond of Martcnsia elcgans Hering in nat. 

 size. Fig. 2 : older frond with lacerated net-work, nat. size. Fig. 

 3 : portion of a linear, elongated frond considered to be an abnormal 

 form of M. denticulata, \ . Fig. 4 : portion of the alternately net- 

 worked frond of J\l. denticulata (?), bearing tetrasporangia in the 

 primary membrane, \. Fig. 5 : portion of the net-work ol R[. 

 cL'^ans bearing cystocarps, -\-. Fig. 6 : cystocarp, ^f. Fig. 7: 

 longitudinal section of cystocarp, **. 



PL. LIV, fig. 1-9. Fig. 1-2 : growing marginal portion oi frond of 

 Jlf. elcgans showing the development of the net-work in surface view, 

 2 i. Fig. 3 : the same further advanced with some cross-bars pro- 

 duced from the longitudinal bars (i.e. lamellae of Svedelius) 1 1 U \ 

 Fig. 4: cross-section of the membranous portion ( I oo /* thick), -;". 

 Fig. 5 a-c : three portions of the longitudinal section of the net-work 



