Isoëtes prototypus

D. M. Britton

Canad. J. Bot. 69: 278. 1991.

Common names: Prototype quillwort
Treatment appears in FNA Volume 2.

Plants aquatic, submerged. Rootstock nearly globose, 2-lobed. Leaves evergreen, dark green, pale reddish brown toward base, spirally arranged, to 12 cm, rigid, gradually tapering to tip. Velum covering entire sporangium. Sporangium wall unpigmented, entirely enclosed in translucent saccate membrane. Megaspores white, 425–575 µm diam., obscurely rugulate with molded and wavy ridges; girdle obscure. Microspores light brown in mass, 24–32 µm, spinulose. 2n = 22.


Phenology: Spores mature in summer.
Habitat: Deep water of cold, oligotrophic, acidic lakes

Discussion

Of conservation concern.

Selected References

None.

Lower Taxa

None.
... more about "Isoëtes prototypus"
W. Carl Taylor +, Neil T. Luebke +, Donald M. Britton +, R. James Hickey +  and Daniel F. Brunton +
D. M. Britton +
Prototype quillwort +
N.B. +, N.S. +  and Maine. +
Deep water of cold, oligotrophic, acidic lakes +
Spores mature in summer. +
Canad. J. Bot. +
Isoëtes prototypus +
Isoëtes +
species +