Saxiglossum POLYPODIACEAE Lemmaphyllum 



2. Saxiglossum Ching #H$M (Ih Shih Wei Shu; Like-the-rock Weed Genus) 



Petrophilous: rhizomes creeping, densely covered with rufous lanceolate scales: 



leaves linear, subsessile; midrib deeply grooved and prominent; margins reflexed; 



stellate hairs dense on lower side, sparse on upper side: sori linear, in one row on 



either side of cost a. One species. 



1. Saxiglossum taenioides (C. Chr.) Ching (Ching 3:146). 3-12 cm. tall; fr. V-XI; 



leaves 3-4 mm. broad. China, Formosa; locally in An., Ki., Ku. Exposed rocks. 



3. Colysis Presl HHM (Hsien Chueh Shu: Thread Fern Genus) 

 Terrestrial ferns: rhizomes creeping; scales ovate to lanceolate, fuscous, clathrate: 

 leaves large, stipitate; lamina simple, pinnately or palmately lobed; pinnae adnate to 

 rachis; lateral veins distinct; areolae with included veinlets: sori linear, continuous 

 or interrupted, one between each pair of lateral veins, oblique to costa. 25 species. 



Key to the Species 



Leaves simple 1 . C. henryi 



Leaves pinnatifid to pinnate 2 . C. elliptica 



1. Colysis henryi (Baker) Ching (Ching 2:91). 30-60 cm. tall; fr. VII-XI; leaves 5 

 cm. broad. China; locally in Ki., Ku. Rocks by streams. 



2. Colysis elliptica (Thunb.) Ching (Ching 1:91) 30-60 cm. tall; fr. IV-XI; rachis 

 narrowly winged. Asia; locally in An., Che., Ki. Rocks by streams. 



4. Loxogramme (Bl.) Presl £IJHI| (Chien Chueh Shu; 

 Two-edged Sword Fern Genus) 



Epiphytic or petrophilous ferns: rhizomes creeping, with ovate entire dark brown 

 scales: roots very hairy: leaves subsessile, somewhat clustered, not articulate to the 

 rhizomes; lamina simple, entire, sessile or nearly so; veins indistinct; areolae without 

 included veinlets: sori linear, oblique to costa or rarely subparallel, without paraphyses, 

 exindusiate. 36 species. 



Key to the Species 



Leaves oblanceolate. with attenuate apex 1 • L. salicifolia 



Leaves spatulate ; apex acute or obtuse 2 . L. grammitodes 



1. Loxogramme salicifolia Mak. (Ching 4:190). 15-35 cm. tall; fr. VI-XI. East 

 Asia; locally in Ki. Moss-covered rocks. 



2. Loxogramme grammitodes (Baker) C. Chr. (Ching 4:189). 3-10 cm. tall; fr. VI- 

 VIII. China, Japan; locally in Ki. Moss-covered rocks. Fig. 21. 



5. Lemmaphyllum Presl 75W0, (Shih Lien Shu; Rock Lotus Genus) 

 Small epiphytic or petrophilous ferns with very slender widely creeping rhizomes; 

 rhizome scales few, thin, clathrate, fuscous, lanceolate, entire or ciliate: leaves far apart, 

 entire, somewhat fleshy usually distinctly dimorphous; fertile leaves linear or linear- 

 lanceolate, sterile leaves obovate, or ovate; venation usually hidden, veins anastomosing 

 forming 3 or 4 series of areolae with free included veinlets: sori round or linear, ex- 

 indusiate, with clathrate, peltate scales when young. 10 species. 



L. drymoglossoides and L. subroslratum usually have two types of leaves but the sori may 

 be borne on the broader ovate leaves as well as on the narrow linear-lanceolate ones. For this 

 reason Ching placed these in a distinct genus Lepidogrammitis. 



54 



