Isoetes prototypus D.M. Britt.

prototype quillwort

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New England Distribution

Adapted from BONAP data

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North America Distribution

Adapted from BONAP data

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Facts About

Prototype quillwort is endemic to New England and far eastern Canada (New Brunswick and Nova Scotia). It is very rare in New England, where it is found only in cold clear lakes in Maine.

Habitat

Lacustrine (in lakes or ponds)

Characteristics

Habitat
aquatic
New England state
Maine
Leaf shape
the vegetative leaves are long and narrow
Spore leaf arrangement
the sporophylls are located in a whorl at the base of the plant
Form of shoot
NA
Horizontal stem
NA
Leaf differences
the vegetative leaves within a node are all similar in size and shape
Teeth on leaf edges
the edges of the vegetative leaves have no teeth
Spore leaf length
Up to 120 mm
Leaf outline
the vegetative leaves are long and very narrow (linear)
Show All Characteristics
  • Clonal plantlets
    Gemma arrangement
    NA
    Gemma shape
    NA
    Gemma width
    0 mm
  • Leaves
    Leaf differences
    the vegetative leaves within a node are all similar in size and shape
    Leaf length
    Up to 120 mm
    Leaf orientation
    • the vegetative leaves are pressed against the stem
    • the vegetative leaves spread slightly away from the stem, at a steep angle
    Leaf outline
    the vegetative leaves are long and very narrow (linear)
    Leaf ranks
    NA
    Leaf shape
    the vegetative leaves are long and narrow
    Pores on leaves
    there are no apparent pores on the vegetative leaves
    Spore leaf length
    Up to 120 mm
    Teeth on leaf edges
    the edges of the vegetative leaves have no teeth
  • Place
    Habitat
    aquatic
    New England state
    Maine
    Specific habitat
    in lakes or ponds
  • Spores or spore cones
    Cone base at stem
    NA
    Cone stalk branching
    NA
    Cone thickness
    0 mm
    Cone width
    0 mm
    Length of cone
    0 mm
    Number of cones
    0
    Quillwort itssue covering spores
    the velum covers all the spores
    Same or different spores
    there are two different types of spores present
    Spore diameter
    0.425–0.575
    Spore girdle
    there is no girdle alongside the equatorial ridge
    Spore leaf arrangement
    the sporophylls are located in a whorl at the base of the plant
    Spore leaf lifespan
    the sporophylls remain green for the life of the plant
    Spore leaf orientation
    the sporophylls slant upwards at a steep angle
    Spore leaf shape
    the spore-bearing leaves are long and narrow
    Spore leaf teeth
    The edges of the spore-bearing leaves are smooth, and without teeth
    Spore texture
    the spore surface has an irregular pattern of ridges and empty spaces (rugulate), or it has minute pits on it (foveolate)
    Sporophyll ranks
    NA
    Sterile tip of cone
    NA
  • Stem, shoot, branch
    Branch cross-section
    NA
    Branch form
    NA
    Constriction zones
    • NA
    • NA
    Form of shoot
    NA
    Horizontal stem
    NA
    Horizontal stem length
    0 mm
    Horizontal stem thickness
    0 mm
    Stem height
    0 mm

Wetland Status

Occurs only in wetlands. (Wetland indicator code: OBL)

New England Distribution and Conservation Status

Distribution

Connecticut
absent
Maine
present
Massachusetts
absent
New Hampshire
absent
Rhode Island
absent
Vermont
absent

Conservation Status

Exact status definitions can vary from state to state. For details, please check with your state.

Maine
extremely rare (S-rank: S1), threatened (code: T)

Native to North America?

Yes

Sometimes Confused With

Isoetes acadiensis:
velum covering less than half the sporangium and leaves pliant and curling at the tip (vs. I. prototypus, with the velum covering the entire sporangium and leaves very rigid and straight to the tip).

Family

Isoetaceae

Genus

Isoetes

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Information from Dichotomous Key of Flora Novae Angliae

6.  Isoetes prototypus D.M. Britt. NC

prototype quillwort. ME. Cold, clear lakes with mineral substrate.