erect and alternate, as appears from a few American specimens and the 

 illustration given in Harvey's Ner. Bor. Amer. tab. 27. Again, branches 

 of Pr. patens are more frequently constricted than would be the case in 

 Pr. lanceolata ; for, though Harvey describes the occurence of the constric- 

 tion in the middle as well as at the extremity of the branches, yet from 

 his illustration, as well as from the specimens just spoken of, the constric- 

 tions are not manifest. 



On the other hand, the more frequently constricted habit of Pr. 

 patens shows its relationship with Pr. Andersoniana. It, however, dif- 

 fers from that species in having no leaflets so broad as to much exceed the 

 breadth of the rachis. Moreover, the breadth of the segments is much 

 greater and substance thinner in Pr. Andersoniana than in those of Pr. 

 patens. 



Thus, the present plant seems to stand between Pr, lanceolata and 

 Pr. Andersoniana , appearing as if to furnish a from transitory from one 

 to the other, 



Prionitis angusta (Harv.) 



Syn. Gymn. ligul. v. angustus Harv. Char. New Alg. No. 29 



Cryptonemia angusta (Harv.) Okam. New or Little known Alg. fr. Jap. p. 

 5 PI. IX.— fig. 8-15. in Bot. Mag. Tokyo, 1895. Vol. IX. No. 106. 



I have given the diagnosis and descriptions of this plant in my paper 

 above cited. In that place, 1 have stated my doubt as to whether it 

 should be placed in Cryptonemia or in Polyopes, on account of the collec- 

 tion of both kinds of fruits in stuted or lengthened lateral proliferations 

 and in terminal non-proliferous segments. Now, on referring this plant 

 to the genus Prionitis, the presence of fruits in those positions does not 

 constitute any anomaly. 



From the resemblance of the present plant with Prionitis elata in 

 the point of structure, habit, substance and consistency, I have referred it 

 to this genus. With that species, Pr. angusta stands in a close relation- 

 ship, only differing in the characters of the fruit-bearing portion. 



Prionitis elata Sp. nov. Fig. 1-2. 



Diagnosis : Fronds high, densely crespitose, linear, ancipito-compress- 

 ed, dichotomous, furnished with similar proliferations from sides and apex, 

 With segments here and there constricted and ending in blunt or bifid 



