23 



with the former. For, in Callophyllis crispata OJeam. cystocarps are 

 formed both on the surface of frond and intramarginal portion, while 

 in C. laciniata Kg. they are exclusively immersed in marginal processes; 

 moreover, they have no prominences in the latter species. Tetraspores, 

 according to J. Agardh's Sp. Alg. II, p. 299, seem to form subsori near 

 margin in 0. laciniata Kg., while in ours they are equally scattered 

 over the frond with no definite order. 



From Callophyllis rhynchocarpa Rupr. and its near ally C. japonica 

 Okam., the habit is widely 'different in the present species, hut the 

 characters of cystocarps are common, though prominences are shorter 

 and fewer in it. 



Plocamium ovicornis sp. no v. 



Diagnosis. Frond flat, membranous, narrow-linear, enerved, dicho- 

 tomo-alternate, patent, much branched upward, leaving the lower 

 portion subnaked, beautifully pinnato-pectinated along branches. 

 Pinnse 3-5, furnished with somewhat irregular, longer and shorter 

 intermixed, similarly constructed pinnse along the side opposite to the 

 normal ones. Pinna3 and pinnules tapering to a sharp point rising from 

 broader base ; opposite ones mostly spiny. Stichidia transformed from 

 pinnulse of both sides, usually two lobed and swollen on a common 

 pelicel, recurved with double rows of tetraspores. Cystocarps 



Log. and Hob This plant has been collected at Enoshima in 

 the province Sagami in Sept. 1878 and has been preserved in the 

 herbarium of Imperial University in Tokio. It bears tetraspores. On 

 July 30, 1893, at Boshu near Enoshima, I also collected two small 

 Sterile fronds which were found on a shell of Haliotis gigantia obtained 

 from a depth of 20 fathoms. 



Description. Frond linear, flat, ecostated, thin membranaceous, 

 6-10 cm high, 0.5-0.8 mm broad. Kamiiications are between alternate 

 and subdichotomous with main branches set widely dichotomous, 

 furnished with short patent alternate branches and beautifully pecti- 

 nato-pinnated along upper branches, leaving the lower portion naked, 

 except for a few decayed pinnas. Pinnas 3-5, usually 4, lowest one 



