41 



the microscope roundish or polygonal from mutual pressure; Oogonia are 

 also collected into roundish, dot-like sori, which radiate above the surfaces 

 of the frond. They are very densely scattered over the frond, almost 

 leaving no sterile marginal line. Both kinds of sori are elevated above 

 the surface of the frond. The sori of tetraspores are much larger than 

 those of oogonia. 



Colour dark yellowish-brown when recent, becoming very opaque in 

 older portions. On drying the plant becomes almost blackish, the brown 

 color being preserved only in younger portions. Substance thick, coriaceous, 

 thin and membranaceous only in the upper portion. 



Remarks : Fruits of both kinds are similar to those of the species 

 of Dietyota and with regard to this point (neglecting the difference of 

 structure), the plant might appear to belong to the subgenus Pleiadophora 

 under the tribe Naevosae. Now, Mr. Holmes has referred the plant in 

 question to Glossophora on account of the structure of frond, as explained 

 in his remarks, in spite of the different characters of fruits. As regards 

 the fruits he says : " Boris ad frondis basim sparsa." This expression 

 does not signify that sori are ecattered over small ligulate leaflets abundantly 

 produced from both surfaces of frond, — what really constitutes the very 

 characteristic feature of the genus Glossophora. 



Caulerpa brachypus Harv. Fig. 15-17. 



This beautiful plant was formerly described by Harvey from the 

 specimens collected by C. Wright at Tanegashima, the northernmost 

 island of the Liukiu archipelago. The author characterised it with the 

 following diagnosis : — 



" Surculo glabro ; phyllodiis subsessilibus elliptico-oblongis basi et apice 

 obtussimis planis enervibus integerrimis nunc hie illic constrictis vel proli- 

 feris." 



This description is very-excellent, but I have found out from the 

 specimens of this species collected at Boshu last summar, that the diagnosis 

 just given does not seem yet sufficient. Moreover, any minute characters 

 can hardly be made out from his description, and so it would not be 

 superfluous to describe here more" minutely. 



Fronds, when firstly formed, obovate or roundish, becoming more and 

 more oblong as they grow up, having roundish or sometimes cuneate base, 

 and having very short pedicels (usually 1-2 mm. rarely 3 mm. long, some- 

 times almost wanting). Fronds are mostly simple but in some specimens 



