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- Clubmosses and relatives, plus quillworts
- Isoetes acadiensis
Isoetes acadiensis — Acadian quillwort
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New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
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Facts
Acadian quillwort is rare in New England, with a few populations in Maine, Massachusetts and New Hampshire representing the southern limit of its distribution along the northern coastal plain. An inhabitant of shallow water of low-nutrient lakes and slow-moving streams, Acadian quillwort is sensitive to changes in hydrology and water quality, especially nutrient runoff.
Habitat
Lacustrine (in lakes or ponds), riverine (in rivers or streams)
Characteristics
- Habitat
- aquatic
- New England state
-
- Maine
- Massachusetts
- New Hampshire
- 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
- Constriction zones
-
- NA
- NA
- Spore leaf length
- Up to 200 mm
- Leaf outline
- the vegetative leaves are long and very narrow (linear)
-
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 200 mm
- Leaf orientation
-
- the vegetative leaves curve outwards and downwards from the main stem
- the vegetative leaves spread away from 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 200 mm
- Teeth on leaf edges
- the edges of the vegetative leaves have no teeth
-
Place
- Habitat
- aquatic
- New England state
-
- Maine
- Massachusetts
- New Hampshire
- Specific habitat
-
- in lakes or ponds
- in rivers or streams
-
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 less than half of the spores
- Same or different spores
- there are two different types of spores present
- Spore diameter
- 0.3999–0.64999
- Spore girdle
- there is a smooth 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 a net-like pattern on it (reticulate)
- 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
- present
- Maine
- present
- Massachusetts
- present
- New Hampshire
- present
- Rhode Island
- absent
- Vermont
- absent
Conservation status
Exact status definitions can vary from state to state. For details, please check with your state.
- Maine
- rare (S-rank: S2), special concern (code: SC)
- Massachusetts
- extremely rare (S-rank: S1), endangered (code: E)
- New Hampshire
- historical (S-rank: SH), endangered (code: E)
Native to North America?
Yes
Sometimes confused with
Family
Genus
From the dichotomous key of Flora Novae Angliae
1. Isoetes acadiensis Kott NC
Acadian quillwort. MA, me, nh; eastern New England. Slightly acidic lakes and slow- moving streams.