﻿55. ASPLENIUM. 437 



§ 3. EU-ASPLENIUM. Veins free. Fronds divided. Ultimate segments with 

 several to many soriferous veins. Indusium opening mostly towards the 

 costa. Hk. Bk., Syn. Fil., tab. IV, fig. 38, a; Diels, I.e., fig. 126. 



§ 4. DAREA. Veins free. Fronds divided. Ultimate segments linear or oblong, 

 each with a single, central soriferous vein. Indusium opening towards 

 the margin. Hk. Bk., I.e., tab. IV, fig. 38, b—c; Diels, I.e., fig. 127, F & H. 



§ 5. LOXOSCAPHE. Like § 4, but sori and indusia much contracted, Davallia- 

 like. Hk. Bk., I.e., tab. II, fig. 18, e; Diels, I.e., fig. 127, J— K. 



§ 6. ASPLENIDICTYUM. Veins anastomosing towards the margin. Fronds 

 divided. Hk. Bk., I.e., tab. IV, fig. 38, h [Hemidiclyum). 



Key to the sections. 



a. Veins quite free. 



h. Sori and indusia contracted, half-cupshaped or semicylindrical, not 



running along the veins. Fronds divided. § 5. LOXOSCAPHE. 



h.b. Sori and indusia not contracted, oblong or linear, running along the veins. 



c. Fronds simple. § 2. NEOTTOPTERIS. 



c.c. Fronds divided. 



d. Ultimate segments linear or oblong, each with a single sori- 

 ferous vein. Indusium opening towards the margin. 



§ 4. DAREA. 



d.d. Ultimate segments various, each with several to many 



soriferous veins. Indusium typically and obliquely opening 



towards the costa or costula. § 3. EU-ASPLENIUM. 



a.a. Veins united at the apex by a transverse, continuous, + marginal or 



intramarginal line. Fronds simple. § 1. THAMNOPTERIS. 



a.a.a. Veins anastomosing more copiously towards the margin. Fronds divided. 



§ 6. ASPLENIDICTYUM. 



§ 1. THAMNOPTERIS. 



a. Fronds linear, loriform, i^j^ — 3 c.M. broad. Indusium black. 



(1) A. colubrinum. 



a.a. Fronds lanceolate or linear-lanceolate, ± 3 — 35 c.M. broad. Indusium not black. 



h. Fronds conspicuously acuminate, raiher rostrate. (2) A. Simonsianum. 



