o 



- 16 - 



scales, the main rachis finally roughish by the persistent bases 

 of the pubescence. Pinnae ca 55 cm long, stalked. Pinnulae short- 

 stalked, linear-lanceolate, 8—12 cm long, ca 2 cm broad at the 

 base, gradually acuminate, deeply pinnatifid, pinnate at the base, 

 the acumen toothed. Tertiary segments linear-oblong, ca 2^/2 

 mm broad, snbacute, subascending, rather falcate, crenate-dentate, 

 the lower ones free, horizontal. Texture chartaceons, fragile when 

 dry; colour dark above, paler beneath; surfaces naked; costae 

 (tertiary rachises) piloso-tomentose above; costae and costalae 

 beneath densely clothed with pale or brown, lanceolate or ovate 

 scales and long, crisped, wooUy, ferrugineous hairs; veins ca 

 6 — 12 on a side, once or twice forked, the higher only simple. 

 Sori 1 — 4 on a side, occupying the lower veins, subcostular, 

 densely intermixed w^ith the costular pubescence : indusium ru- 

 dimentary, represented by a very minute brown scale on the inner 

 side. 



Sumatra. 



lleiilîteiîa ca mi i pin 11 11 la. r. .J. i% ti. 



Ampkicosmia. — Frondes 3-pinnatifîdae, rachidibus primariis 

 secundariisque laevibus vel leviter asperis, supra glabris, subtus 

 decidue ferrugineo-tomentosis. Pinnae probabiliter 35-40 cm 

 superantes, sessiles vel subsessiles, vel inferiores petiolulatae. Pin- 

 nulae subsessiles, glabrae, lineari-lanceolatae, ca 8 cm longae, basi 

 ca 11/2—1^/4 cm latae, apice fere abrupte subcaudato-acuminatae 

 et integerrimae vel subcrenatae, ceterum profunde pinnatifidae, 

 segmentis (lobis) lineari-oblongis, ca 21/2 mm latis, obtusis, sub- 

 falcatis, integerrimis vel subcrenatis. inferioribus patentibus, non 

 liberis, subtus quam supra pallidioribus. Costae supra glabrae, 

 subtus thstincte sed non dense squamulosae et pilosae; costulae 

 supra glabrae, subtus parce squamulosae; .squamulae costales 

 costularesque vix convtxae; venae 6 — 9 utrinque, inferiores et 

 medianae furcatae, superiores simplices. Sori 4 — 8 utrinque, ad 

 venas inferiores; indusium semiorbiculare, parvum sed distinctum, 

 non rudimentai-e. — Ceterum H. sumatranae similis. 



Sumatra (Lïibu-alam, Teysmann No. 2444) 



llcsiiBtelîa ;;'hiiic*o|ili.viBa. r. .1. t\ iî. 



A'rnphicosmia. — Frondes 8-pinnatifidae. Pinnae ascendentes 

 vel subpatentes, subsessiles, usque ad ca 60 — 70 cm longae. Pin- 



