— 22 - 



D, rigido Hk. affine sed frondibus minoribus; frondibus sterilibus 

 brevissime peiiolulatis, areolis venulis liberis paucis, saepe excurrentibus 

 munitis; frondibus fertilibus (cum siccis turn madefacti?) obtuse quadrangul- 

 aribus, i.e. supra subtusque sat applanatis, lateribus ieviter convexis, sulcis 

 soriferis in sectione transverali parallelis. 



D. rigidum Hk. differs in having the fronds larger, the barren fronds 

 on stalks as long as themselves, the areolae without free venules, the fertile 

 fronds subsemiterete, i.e. Convex above, rather flat baneaih, the soral grooves 

 with the mouths remote and the bottoms approximated (conf. Hooker in 

 Icon. Pl., X, tab. 996). 



Borneo (Teuscher). 



Dryopteris subulifolia, v.A.v.R. 



Lastrea. — Rhizoma ascendens, squamis paucis, subalatis, fuscis, villosis. 

 Stipites approximati, + 20 — 30 cm. longi, pallide griseo-fusci, dense pallide 

 brevi-puberuli, auriculis (pmnis reductis) remotis, rotundatis, 1 mm. diamet- 

 ientibus muniti. Frondes e basi lata subsubuliformes, + 20 — 30 cm. longae, 

 + 6 — 8 cm. latae, acuminatae, rachide pilis longiusculis curvatisque dense 

 pallide villosa. Pinnae firmiter herbaceae, infra pinnam terminalem + 25 — 30 

 utriiique; pinnae terminales subulato-deltoideae, apice crenatae, basin versus 

 sensim profunde pinnatifidae ; pinnae laterales approximatae ve! sat remotae, 

 basales vel suprabasales maximae, sessiles vel subsessiles, sat horizontales, 

 lineares, usque ad 4 cm. longae et — 1 cm, latae, apice acuminato cren- 

 atae, margine usqe ad ^/^ costam versus incisae, basi plus minusve trunc-, 

 atae; costa supra partim breviter puberula, partim acute longe setosa 

 subtus copiose appresso-hirsuta. Lobi approximati, lineari-oblongi, 1 — I'/a 

 mm. lati, obtusi, integerrimi, ciliati, sinibus obtusis separati; costulae ven- 

 aeque supra glabrae vel parce setulosae, subtus appresso-setulosae; venae 

 3 — 4 utrinque, simplices, obliquae. Sori ad venas mediales; indusium 

 persistens, puberulum. 



D. Beddomei O. Ktze differs from this principally in having the lower 

 pinnae gradually reduced, and the sori ternimal on the veins. 



Sumatra {Bengkoelen, Lebong Simpang, C.J. Brooks No. 334/S). 



Dryopteris obtusata, v.A.v.R. 



Lastrea. — Stipites fasciculati, + 10 — 12V2 cm. longi, cum rachide 

 pallide fusci et dense villosi ; pili ochracei, squamulis subulato-triangularibus, 

 Ieviter crispis, patentibus, sparse intermixti. Frondes elliptico-lanceolatae, 

 + 17'/2 — 25 cm. longae et 7 — S'/o cm. latae, acuminatae. Pinnae firmiter 

 herbaceae, infra pinnam terminalem + 12 — 14 utrinque ; pinnae terminales 

 triangulares, apice acuminato integerrimae, basin versus sensim profunde 

 pinnatifidae; pinnae laterales approximatae, lineari-oblongae, mediales vel 



