VI INTEODUCTION. 



SEn's delimitation sbonld liave uo ti-ne liau', bas txiie imieellnlar haii'; wliile 

 D. Siehddii (yan Houtte) O. Ktze, wliicli is takeu as another tvj^je of the 

 same subgenus, has trae multi-cellular haii'. I have uo doubt, bowever, tbat 

 the two Just referred to could be quite uatiu'ally assigned to the subgeuiLS 

 named, as niight be seen from tbeii- general characters. With a very few 

 exceptious, his delimitation of subgenera and classification of the geuus are 

 veiy uatiu"al, aud I have, therefore, foUowed his svstem solelv. 



As to my new species mentioued in this volume, I bave described them 

 as accm-ately and fully as ix)ssible and iu almost all cases, save where the 

 number of pages or the waut of materials forbade, I have supxilemented 

 them with figm-es, in plates or in the text. Accordingly, I beheve that any 

 one who is familiar with the plants in question can at once decide whether 

 my species should be recognized, or should Ije reduced, without taking the 

 tronble to look at my types. As to fems, I have added to fuH descripfcions 

 photographs of whole forms and magnified sketches of pinnse or ijinnules, 

 scales aud sori. As a type for description, I liave takeu the largest fonu 

 possible ; for desciibing pinnse or pinnules, I have taken basal ones ; aud 

 for angles of pinnse, I have taken the middle ones. Great attention has 

 been paid to.venation and the stmctm-e of hairs. 



All the species of phanerogamous plauts are here arranged, as in the 

 preceding volumes, after the system of Bentham aud Hookee, while those 

 of vascular ciyptogamia are an-anged after the system of ESGLER aud Pkaktl. 

 The sco]pe of the present volume is the same as that of the pi-eceding 

 volume. 



In conclusion, I avail myself of this opportimity to teuder my hearty 

 tbanks to the officials of the Govemment of Formosa to whom I am much 

 indebted for help in the coUection of materials and iu the publication of 

 this work. 



B. HAYATA. 



August 31, 1914, Taihoku aud TOkyo. 



