Character

C. acutum

C. tenuipes

C. xalapense

Long of rhizome scales

3 - 6 mm

5 - 8 mm

3 - 5 mm

Broad of rhizome scales

0.5 - 1.5

1 - 1.5

0.2 - 0.5

Color of rhizome scales

yellowish-brown to brown

brown

dark brown to blackish

Lumen color of rhizome scales

translucid

translucid

brown

Size of fronds

(20-) 45 - 93 cm

30 - 80 cm

(20-) 30 - 60 cm

Long of stipe

1/12 - 1/9 of the frond length

1/3 of the frond length

1/10 of the frond length

Broad of blade

(2-) 3 - 4.3 (-5.5) cm

4 - 9 cm

3 - 5.5 cm

Blade apex

acute to attenuate

acuminate to cuspidate

acuminate to cuspidate

Rows of areoles between parallel veins

commonly two

two

one

Rows of sori between midvein and margin

4 - 6

6 - 10

4 - 7

Altitudinal distribution

1000 - 2700 m

1000 - 2300 m

500 - 1700 (-2300) m