154 



BOTANICAL MAGAZINE. 



[Vol. xvir. 



The specimens collected in July and August (this I would call summer 

 form) have the fronds lineari-spathulate with obscure serrature. The 



thickness of the fronds mea- 

 sures 0.2-0.25 mm. and the 

 edge is more or less ancipit- 

 ous. In a plant about 16 cm. 

 long the fronds growing face 

 to face were counted 4 pairs 

 among 23 fronds. The mar- 

 Fig.2. XI. g^j^g ^£ ^^^ fronds, though 



apparently unserrated, showed minute denta- 

 tion with small but sharp teeth (fig. 3). 

 The cellwall at the spinous region is much 

 thicker than at sinus. In some fronds they 

 were more or less regularly arranged each at 

 a distance rangino; from 1. to 1.5 mm. Some 

 were absolutely smooth. The young fronds 

 are mostly simple (fig. 2.) but the matured 

 ones have the proliferations on the surface 

 as well as the margins, (fig. 1). 



The specimens collected in December have a very 

 robust appearance (this I would call winter form). The 

 full grown fronds measure about 6-7 mm. in the breadth 

 and as high as 3cm. with the both ends obtuse (fig. 4), 

 The fronds bifurcate, or give off proliferations more at the 

 margin than from the surface. Some of the fronds are 

 found standing oppositely. The serrature is highly distinct 

 in the adult fronds, each tooth at a distance of 1.5-2. 5 mm. 

 The cellwall is, as in the summer form, more thickened 

 at the spinous region than at the sinus (fig. 5). In the 

 proliferated fronds they are not so conspicuous as the 

 mother fronds, and are similar in appearance to the case 

 of the summer form. Thickness of the fronds measures 

 0.35-0.4 mm. with round edge. 



The summer form gradually changes into the winter 

 form at the beginning of autumn. The fronds become 

 thicker and thicker, the dentations gently conspicuous. 

 The winter form withers late in March as Misaki. In 

 April the fronds are mostly found near at the growing regions of the 



