2 : 

 13 



Plocamium ovifornie Okam. 



Nom. Japi : Hime- Yukari, 

 PL. CIII, Fig. i-s. 



Plocaminm ovicornis Okam. Contrib. Mar. Algae of Japan II (Bot. 

 Magaz. Tokyo Vol. X, 1896), p. 23, t. Ill, f. 3-4. PL ovifornie Okam. ; 

 De Toni Syll. Alg. IV, p. 590 ; Nuova Notarisia 1897, p. 26. 



"Frond linear, flat, ecostated, thin membranaceous, 6-10 cm. 

 high, 0.5-0.8 mm. broad. Ramifications are between alternate and 

 subdichotomous with main branches set widely dichotomous, furnished 

 with short patent alternate branches and beautifully pectinato-pinnat- 

 ed along upper branches, leaving the lower portion naked, except for 

 a few decayed pinnae. Pinnae 3-5, usually 4, the lowest one simple 

 or compound, sometimes slightly bent backward, the higher in series 

 pinnulated in the usual manner. Secondary pinnae and pinnulae arise 

 along the side opposite to that, where the normal ones stand. They 

 are subulate or spinose, and shorter than the normal ones, and are 

 either simple or similarly pinnulated. They do not correspond in 

 number to the normal ones, and are not definite in arrangement, but 

 are mostly alternate with the normal ones. Stic/iidia transformed 

 from pinnules of both normal and opposite pinnae and are thus seriated 

 along both margins of rachis. They are swollen and usually 2-lobed 

 on a common slender pedicel and are recurved appearing like the let- 

 ter r or the horn of a sheep ; they are sometimes single, the one 

 branch being suppressed, or one remains simple, while the other is 



