156 POLYPODIACE^E. 



smaller than the preceding species, its stems being also marked with leaf- 

 scars and 1-4 m. tall, its frond ovate-oblong 170-200 cm. long, 85 cm. broad, 

 and its stipes 40-50 cm. long and very aculeate at the base. These four 

 species are widely distributed in the island from Koshuu northwards to 

 Kelung. They are all that I know from Formosa. As to the other species 

 recorded from the island, A. contaminans, A. pastidosa and A. tomentosa are 

 presumablly forms of A. latebrosa. A. subglandulosa HANCE is very likely a 

 species of Dryoptens, as far as I can conjecture from a drawing made by 

 myself in the British Museum from the original specimen preserved there ; 

 and finally Alsophila denticulata BAKER mentioned in Journ. Bot. (1885) 

 p. 102 and MATSUM. et HAYATA Enum. PI. Formos. p. 571, is very likely 

 a species belonging also to Dryoteris. So far as I am aware, we have never 

 seen so small a tree-fern as the latter species described as " stipe about a feet 

 long ; frond ovate-deltoid, 1^ ft. long, tripinnati-fid, but fertile also in a 

 bipinnate form." 



Polypodiaeeae.* 

 Athyrium ROTH. 



Athyrium cryptogrammoides HAYATA sp. nov. Rhizoma ignotum. 

 Stipes 10-25 cm. longus stramineus basi sparse squamatus, squamis lanceolatis 

 castaneis apice acuminatis 5 mm. longis 1 mm. latis basi haud contractis. 

 Frons in ambitu oblonga 30 cm. longa 15 cm. late apice acuminatissima basi 

 obtusa tripinnata, pinnis mediis alternis 10 cm. longis 3 cm. latis in ambitu 

 lanceolatis apice acuminatissimis basi obtusissimis, pinnulis ordinis I. mediis 

 oblique triangulari-lanceolatis 2 cm. longis 7 mm. latis apice obtusis basi oblique 

 truncatis, pinnulis ordinis II. infimis longissimis, mediis obovatis 5 mm. longis 

 2 mm. latis apice obtusis basi oblique cuneatis pinnatilobis, lobis utroque 

 latere circ. 2 lineari-oblongis 1 mm. longis f mm. latis basi haud contractis 

 apice acutis vel obtusis 1-nerviis, nervis simplicibus haud furcatis prope 

 apicem attingentibus. Sori basi loborum pinnularum ordinis II. singulariter 

 siti. Indusium lineare reniforme vel cordatum 1-^mm. longum f mm. latum 

 margine erosum. Textura chartacea vel chartaceo-coriacea ; pinnse a rhachibus 



* For convenience sake, the genera under this family are arranged in alphabetical order. 



