93. OPHIOGLOSSUM. § 1. EU-OPHIOGLOSSHM. 773 



+.+. The whole plant + i5 c.M. high, with the 

 barren segment obovale, broadest above the mid- 

 dle. (8) 0. obovalum. 

 f.f. Veins distinct. 



g. Barren segment membranaceous. 



(9) 0. timorense. 

 g.g. Barren segment flaccid or subcarnose. 



(10) 0. pedunculosum. 

 c.c. Barren segment cordate, subtruncate or rounded at the base. 



+. Barren segment with the margin minutely crenulate, i. e. 

 bordered by a row of cellules, which have the outer wall 

 convex (*), (10) 0. pedunculosum. 



+.+. Barren segment with the margin quite continuous, i. e. 

 bordered by a row of cellules, which have the outer wall 

 straight (*). (11) 0. reticulatum. 



(1) O. samples., nidi., Ann. of Bol., XVIII, 205, tab. XV; XXII, 

 327. 



Rhizome short, tuberous. Fronds solitary or in pairs, 10 — 15 c.M. high, 

 flattened, I to 3'/, mm. broad, the sterile segment absent or rudimentary and 

 represented by a more or less pronounced outgrowth at » obort distance 

 below the fertile region, with a slightly increased width of the petiole below 

 that point. Fertile spike | to 2 '/j mm. long, flat. 



Sumatra^ [ Borneo . 



(2) O. gramineum, WUld., Prantl, Ophiogl., 511, tab. VII, fig. 4. 

 Rhizome cylindrical, slightly tuberous. Fronds commonly in pairs, + 



4*/2 c.M. high; sterile segment linear or linear-lanceolate, 1 — I'/j c.M. 

 long, 1 — 2 m.M. broad, sessile, placed below the middle, the apex acute. 

 Texture rigid; primary veins Si, the central one stouter, straight, the late- 

 ral parallel, reticulate; areolae elongate, rarely with free veinlets. Fertile 

 spike under 1 c.M. long, the peduncle 1 — 2 X as long as the barren 

 segment. 



New Guinea; Br. India, West. Africa. 



(*) Only visible in fresh or boiled material, by high (± 100 X) magnifying po- 

 wer. 



