24 



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

 series pinnulated in the usual manner. Secondary pinnae and pinnula? 

 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. Stichidia transformed from 

 pinnules of both normal and opposite pinna? 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 letter r 

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

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

 2-lobed in a similar manner. Tetraspores are seen to be arranged in a 

 single row, when viewed from the side, but when viewed from above, 

 they are seen to be arranged in a double row. Color rosy-red. 



Remarks. The presence of pinna? and pinnula? opposite to the 

 normal ones, and two-lobed recurved stichidia seriated along both sides 

 of frond seem to be well distinguished characters. The present plant 

 may be, according to J. Agardh's Epicrisis, refered to the section 

 Plocamium. Among the species belonging to that section there is none 

 which stands nearer to the present plant on the above-stated characters. 

 Plocamium leplopliyllum Kg. var. flexuosum alone often has opposite 

 adventitious pinnae, which plant is, however, different from the present 

 plant in the character of stichidia. 



Von Martens mentions Plocamium affinis Kg., in his "Preus. Exped. 

 n. Ost Asien " p. 119, as having been obtained on Capea Richardiana 

 J. Ag. at Fokosuka. This plant is described in Kutzing's Sp. Alg. p. 884 

 with a very short diagnosis, which J. Agardh quotes in his " Species 

 Alg." II, p. 405, while that author makes no reference to this plant in 

 his " Epicrisis." I do not know whether it is synonymous with some 

 other species or a distinct one. From Kutzing's descriptions, nothing 

 is known of stichidia and the number of pinna?. With this species 

 the present plant does not seem to be identical, though 1 have not 

 seen specimen of it ; for Kiitzing says of terminal pinna? " summis 

 apices revolutis vel subhamatis/' which is not the case in the present 

 plant. 



