Species: Botrychium pedunculosum W.H. Wagner

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Botrychium pedunculosum W.H. Wagner

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TAXONOMY

Family:

Ophioglossaceae

Genus:

Botrychium

Species Synonyms:

none

Common Names:

stalked moonwort

DISTRIBUTION

Canada:

central British Columbia, southwestern Alberta, southwestern and east-central Saskatchewan

Saskatchewan:

southwestern and east-central Saskatchewan

Ecoregion:

Cypress Upland, Mid-Boreal Lowland

HABITAT

Saskatchewan:

open pine or spruce woods on rotting wood litter

Canada:

bushy habitats along streams and roadsides

RARITY STATUS

Provincial Status According
to Harms (2003):

Endangered

Nature Conservancy Status:

G2G3 N1 S1

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Botrychium pedunculosum is endangered because of extreme rarity in Saskatchewan and is almost always locally sparse. No immediate threats are known but are possible in the future.

SPECIES DESCRIPTION

Height:

< 25 cm

Stipe:

common stalk with reddish-brown stripe

Fronds:

solitary, sterile blade stalk 0.8 – 2.5 cm long, to 1.1 times length of rachis, blade to 4.5 cm long, 2 cm wide, ovate to oblong, once pinnate, leathery, dull green; pinnae up to 5 pairs, ascending, approximate to distant, distance between first and second pinnae equal or slightly greater than between second and third pairs, basal pinnae equal in size to second pair, ovate to spatulate, venation pinnate, margin lobed; fertile blades 2 – 4 times as long as sterile blades, 1 – 3 times pinnate

Sporangia:

short-stalked to sessile on lateral branches, round

Spores:

small, yellow

BOTRYCHIUM KEY FOR SPECIES FOUND IN SASKATCHEWAN

1 Sterile blades 5 – 25 cm long, deltate, 2 – 4 times pinnately compound; fertile blades may be absent; plants over 12 cm tall	2
1 Sterile blades 2 – 5 cm long or absent, oblong to linear or deltate, simple to pinnate or pinnatifed; fertile blades always present; plants generally less than 15 cm tall	3

2 Sterile blades thin; sheaths on stipe open; fertile blades, when present, arising from high on common stalk; common stalk usually longer than 10 cm, glabrous	B. virginianum
2 Sterile blades herbaceous or thick to leathery; sheaths on stipe closed; sporophores, when present, arising from the basal portion of the common stalk; common stalk less than 8 cm long, somewhat hairy	B. multifidum

3 Sterile blades linear to oblong, simple to lobed; plants in deep shade under shrubs and trees	B. simplex
3 Sterile blades linear to deltate, pinnate or absent; plants usually in exposed sites	4

4 Distance between first and second pinnae greater than that between second and third pairs	B. simplex
4 Distance between first and second pinnae equal to or slightly more than between second and third pairs	5

5 Sterile blades present, basal pinnae fan-shaped to spatulate, midrib absent	6
5 Sterile may be replaced by fertile blade, basal pinnae oblanceolate to linear to ovate, midrib present	9

6 Sterile blades ovate to deltate	B. simplex
6 Sterile blades oblong to lanceolate	7

7 Sterile blades thick and leathery, dark greyish-green to yellowish; basal pinnae broadly fan-shaped	B. lunaria
7 Sterile blades thin (except B. campestre), dark to light green or yellowish; basal pinnae narrowly fan-shaped or cuneate to linear	8

8 Sterile blades folded longitudinally, up to 5 pairs of pinnae; plants of prairies or meadows	B. campestre
8 Sterile blades flat or folded only at the base, up to 10 pairs of pinnae; plants of woodlands	B. minganense

9 Sterile blade replaced by fertile blade, resulting in two fertile blades	B. paradoxum
9 Sterile blade present, distinct from fertile blade	10

10 Sterile blades subsessile, blades deltate; fertile blades divided equally several times, about equal to 2.5 times longer than sterile blades	B. lanceolatum
10 Sterile blades ovate to oblong or deltate; fertile blades with one main axis, 2 – 4 times longer than sterile blades	11

11 Sterile blade long-stalked, stalk equal to length of blade; few sporangia may be present on the basal pinnae of sterile blade	B. pedunculosum
11 Sterile blade sessile to short-stalked, stalk less than ¼ length of blade; sporangia never present on basal pinnae of sterile blade	B. hesperium