Character

C. angustifolium

C. gracile

C. madrense

Diameter of rhizome

2 - 5 mm

1.5 - 2.5 mm

2 - 5 mm

Pruinose rhizome

yes

not

not or scarcely so

Distance between fronds

approximate to 5 mm distant

approximate

approximate to 2 mm distant

Long of rhizome scales

3 - 5 mm

1.5 - 3.0 (-4.0) mm

3 - 6 mm

Broad of rhizome scales

1.0 - 1.7 mm

0.5 - 1.0 mm

0.4 - 0.8 mm

Margin of rhizome scales

entire

entire to denticulate

denticulate

Color of rhizome scales

yellowish-brown to grayish-brown

brown to dark brown

dark gray to blackish

Form of apical cells of

rhizome scales

poligonal, elongate

poligonal, isodiametric

rectangular to oblong

Long of cell of rhizome scales

1.5 - 3.0 times longer than wide

1 - 2 times longer than wide

2 - 5 times longer than wide

Lumen color of rhizome scales

translucid

brown

gray

Frond size

20 - 45 (-75) cm

(10-) 18 - 40 (-55) cm

(18-) 30 - 65 cm

Diameter of stipe

1 - 2 mm

0.7 - 1.0 mm

1 - 1.5 (-2) mm

Broad of blade

0.4 - 1.5 (-2.0) cm

0.3 - 1.5 (-2.0) cm

(0.5-) 0.8 - 1.5 cm

Altitudinal distribution

(700-) 1200 - 1600 (-2000) m

0 - 900 (-1200) m

25 - 940 m