Character

S. fraxinifolium

S. ×orosiense

S. loriceum

Rhizome diameter (mm)

3 - 6

4 - 6

3 - 5

Rhizome surface covered by scales (%)

90 - 100

70 - 90

50 - 80 in the area, 10 - 30 in Caribbean islands

Size of rhizome scales (mm)

(1.5 - ) 2 - 3 × (1 - ) 1.5 - 2

1 - 2 × 1 - 1.5

0.7 - 1.5 × 0.7 - 1.0

Blade size (cm)

30 - 60 (-75)

46 - 72

30 - 60 (-85)

Blade division

1-pinnate throughout

1-pinnate basally to pinnatisect distally

Pinnatisect throughout

Blade shape

ovate to deltate-lanceolate

deltate-lanceolate

to narrowly lanceolate

deltate-lanceolate to lanceolate

Blade apex

conform

subconform

pinnatifid

Pinnae pairs

(4-) 7 - 15

22 - 28

10 - 22

Pinnae shape

lanceolate to elliptic

linear-lanceolate

linear-lanceolate

Pinnae broad (cm)

(1-) 2.5 - 3.5

(0.9-) 1.5 - 2.5

0.8 - 1.5 (-2.0)

Pinnae apex

cuspidate

acuminate

acute

Number of areolar series with a free veinlet included

4 - 5

2 - 3

1 - 2

Number of sori series

3 - 5

1 - 2

1

Color of spores

yellow

whitish

yellow

Spore shape

ellipsoidal

ellipsoidal or collapsed

ellipsoidal