4Sa. PTERIS. § 5. LITOBROCHIA. 375 



into linear-oblong, falcate lobes 1—2 c.M. long, ± 5 m.M. broad, lowest pinnae 

 15—23 c.M. long, ^%—i c.M. broad, with a single, similar, but smaller 

 pinnula at the base on the lower side. Texture herbaceous ; rachis and surfaces 

 naked; veins anastomosing copiously. Sori not reaching the subenlire apices. — 

 The form found in Batjan has the veins only slightly anastomosing. 

 Batjan; Polynesia, Trop. Australia. 



* (44) PI., tripartita, Sw., Hk., Spec. Pil., U, 225 (excl. /5 & y); 

 Pi. marginala, Bory, Rac, Flor. Btz., I, 158; Litobrocliia margiuata, Pr., Bedd., 

 Handb. Ind. Perns, 122; L. tripartita, Pr., Bedd., Perns S.I., tab. CCXX. 



Stipes 30 — 150 c.M. long, strong, erect, naked, polished, stramineous or 

 brownish. Fronds deltoid, + 50—150 c.M. each way. Central branch with 

 a terminal pinnula 7 — 25 c.M. long, 8-^25 m.M. broad, cut down nearly to 

 the costa into numerous closely placed, linear, straight or falcate, spreading 

 or erecto-patent lobes on each side, which are entire or slightly toothed when bar- 

 ren; below Ibis many closely placed, similar lateral pinnulae on each side. Lateral 

 branches similar to the central one, but a little smaller, unbranched or branched 

 again at the base on the lower side. Texture commonly herbaceous; rachises 

 and surfaces naked; veins fine, anastomosing principally in arches against the 

 midribs and costulae. Sori falling rather short of the apex of the segments. 



Paleotro]:)ical. 



Species of aniuncertain systematical place. 



(45) l»t. mertensioides, wma.. Spec, V, 394. 



Fronds 60 c.M. or more long, 2-pinnate. Lowest pinnae 15 — 17 '/a c.M. 

 long, highest 7'/2 c.M. long. Pinnulae linear-lanceolate, sessile, subacute, 

 entire, subconfluent, 1 — l*/j c.M. long. Texture thinly membranaceous. Sori 

 narrow. — Pinnae resembling the leafy branches of Mertensia. 



Java, Borneo, Amboyna. 



4.Bb. IIEM:IF»TEI«,1S, Kosengtoch. 



Like Pteris, but the sori occupying only the posterior edge of the ulti- 

 mate segments, the anterior side destitute of sori. Fed., Rep., V, 38, 

 Papuan. 



