State-Listed Pteridophytes in Maine

These are the lycophytes, ferns and fern allies that are officially listed as rare by the State of Maine. The information is taken from the Maine Department of Agriculture, Conservation and Forestry's Maine Rare Plant List and Rare Plant Fact Sheets.

STATE RANK

S1

Critically imperiled in Maine because of extreme rarity (five or fewer occurrences or very few remaining individuals or acres) or because some aspect of its biology makes it especially vulnerable to extirpation from the State of Maine.

S2

Imperiled in Maine because of rarity (6-20 occurrences or few remaining individuals or acres) or because of other factors making it vulnerable to further decline.

S3

Rare in Maine (20-100 occurrences).

S4

Apparently secure in Maine.

S5

Demonstrably secure in Maine.

SH

Known historically from the state, not verified in the past 20 years.

SX

Apparently extirpated from the state, loss of last known occurrence has been documented.

SU

Under consideration for assigning rarity status; more information needed on threats or distribution.

S#?

Current occurrence data suggests assigned rank, but lack of survey effort along with amount of potential habitat create uncertainty (e.g. S3?).

Global Rank

G1

Critically imperiled globally because of extreme rarity (five or fewer occurrences or very few remaining individuals or acres) or because some aspect of its biology makes it especially vulnerable to extinction.

G2

Globally imperiled because of rarity (6-20 occurrences or few remaining individuals or acres) or because of other factors making it vulnerable to further decline.

G3

Globally rare (20-100 occurrences).

G4

Apparently secure globally.

G5

Demonstrably secure globally.

GNR

Not yet ranked.

State Status

E: Endangered

Rare and in danger of being lost from the state in the foreseeable future; or federally listed as Endangered.M.dd<

T: Threatened

Rare and, with further decline, could become endangered; or federally listed as Threatened.

SC: Special Concern

Rare in Maine, based on available information, but not sufficiently rare to be considered Threatened or Endangered.

PE: Potentially extirpated

Species has not been documented in Maine in past 20 years or loss of last known occurrence has been documented.

Other Notations

*Probably no longer present in state