1	Soral line marginal, immersed in groove, open outward		(2)
+	Soral line submarginal		(3)
2 (1)	Lamina up to 100 cm or longer, ca. 10 mm wide; stipe long, slender; scales dark brown.		12 H. elongata
+	Lamina 8-30 cm, 2-4 mm wide; stipe short; scales yellow-brown.		13 H. anguste-elongata
3 (1)	Soral line superficial; lamina margins straight or revolute		(4)
+	Soral line immersed in groove between costa and margins of lamina; lamina margins revolute		(8)
4 (3)	Scales dark brown, small, straight, areole wall thick; soral line submarginal, covered by revolute margins of lamina.		1 H. amboinensis
+	Scales yellow-brown, large, soft, twisted, areole wall thin; soral line with a broad area between margins of lamina		(5)
5 (4)	Lamina 2-3 mm wide; scales 3-7 ?ca. 0.2 mm; soral line close to costa.		5 H. mediosora
+	Lamina over 5 mm wide; scales 10-20 ?0.5-2.5 mm; soral line with a broad area between costa		(6)
6 (5)	Stipe short, thick; lamina 10-30 mm wide; scales 10-20 mm.		2 H. doniana
+	Stipe absent, or slender; lamina 5-12 mm wide; scales ca. 10 mm		(7)
7 (6)	Lamina 6-12 mm wide; soral line 1-1.5 mm away from margins of lamina.		3 H. taeniophylla
+	Lamina 5-6 mm wide; soral line ca. 1 mm away from margins of lamina.		4 H. himalayensis
8 (3)	Lamina 5-10 mm wide, or more		(9)
+	Lamina (0.5-)2-4(-11) mm wide		(10)
9 (8)	Costa not raised adaxially, lamina with a narrow concave line adaxially.		6 H. plurisulcata
+	Costa raised adaxially, lamina with a broad concave line on each side of costa adaxially.		7 H. fudzinoi
10 (8)	Scales dark or light brown, 5-10 mm		(11)
+	Scales yellow-brown, 2-3 mm		(12)
11 (10)	Scales light brown; lamina with soral line very close to costa.		8 H. linearifolia
+	Scales dark brown; lamina with soral line close to margins.		9 H. hainanensis
12 (10)	Costa flattened abaxially, wide; soral line covered by costa.		10 H. sikkimensis
+	Costa raised abaxially, narrow; soral line with a broad area between costa.		11 H. flexuosa