altered branehlets, but not in specially formed sporophyUs. 



Prionitis patens Sp. nov. 



Pr. angusta (Harv.) 



7>. Fruits of both kinds collected only in specially formed 

 minute sporophylls. 



Pr. elata Sp. nov. 



Pr. articulata Sp. nov. 



Pr. Schmitziana Sp. nov. 



Prionitis patens Sp. nov. Fig. 18-20. 



Diagnosis : Frond piano-compressed, broadly linear, rising from a cal- 

 lous disc, shortly stipitate, 2-3 times pinnate by repeated proliferations 

 with a few dicliotomous segments ; branches very patent or almost horizon- 

 tal, distichous, narrowed towards the base and constricted at different 

 intervals, provided with simple or forked lateral proliferations, ending in 

 ligulate apex. Fruits of both kinds densely collected in lateral leaflets and 

 terminal segments : tetraspores forming linear oblong sori ; cystocarps, 

 minute dot-like, slightly prominent. 



Hab. Bosnia Sagami, Mikawa, Shima, 



Description. Plants attain the hight of 10-20 cm. Ramification 

 pinnate with dicliotomous segments. Branches 2-6 mm. broad, here and 

 there narrowed, giving the appearence of linear-lanceolate or oblanceolate 

 form in the broader ones. 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 dicliotomous. 

 Substance soft cartilaginous and the plant does not adhere to paper in 

 drying. Colour a dull brownish red, becoming darken in drying. 



Remarks : The present plant has many points in common with Pr. 

 lanceolata, such as the linear habit of frond, arrangement of pinnulae, 

 structure, substance and colour. The branches of Pr. patens are in many 

 cases opposite (though often irregularly disposed) and very patent being 

 almost horizontal, which those of Pr. lanceolata Harv. seem to be more 



