74 ~*~ 



ceolate or oblanceolate form in the broader ones, 26 mm in breadth. 

 Proliferations are minute teeth-like processes at the beginning', which 

 grow up into oblong or linear-oblanceolate leaflets. They are either 

 simple or forked and gradually pass into branches similar to the 

 remaining. They arise pinnately from margins and often radiately 

 from apex. Branches of every order end in ligulate or not-strongly 

 acute apex, and are often forked or sometimes become irregularly 

 dichotomous. Fruits of both kinds densely collected in lateral leaflets 

 and terminal segments : tetraspores forming linear oblong sori ; cysto- 

 carps, minute dot-like, slightly prominent. Substance soft cartilagi- 

 nous and the plant does not adhere to paper in drying. Colour a dull 

 brownish red, becoming darker in drying. 



Hab. : Boshyu, Sagami, Idzu, Mikawa, Shima. 



PL. LXX. Fig. 1 : fructified frond of Prionitis patens Okam. 

 in nat. size. Fig. 2-3: cross-section of frond, 3 j. Fig. 4: cortical 

 portion of the same as fig. 2, showing arrangement of cells, <Mp. Fig. 

 5 : longitudinal section of frond, ? -|-^. Fig. Q : portion of frond bear- 

 ing cystocarps, -|-. Fig. 7 : portion of branch bearing cystocarps, 

 s. Fig. 8: cross-section of a branch bearing cystocarps, */. Fig. 

 9 : placental cell with filaments surrounding the nucleus, 3 --. Fig. 

 10: piece of branch bearing tetrasporic sori, slightly magd. Fig. 

 11 : cross-section of a tetrasporic sorus, ~. 



