Difference between revisions of "Isoëtes louisianensis"

Thieret

Sida 5: 129. 1973.

Common names: Louisiana quillwort
Treatment appears in FNA Volume 2.
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|genus=Isoëtes
 
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|species=Isoëtes louisianensis

Latest revision as of 20:23, 5 November 2020

Plants aquatic, emergent. Rootstock nearly globose, 2-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged to 40 cm, pliant, gradually tapering to tip. Velum covering less than 1/2 of sporangium. Sporangium wall brown-streaked. Megaspores white, 500–625 μm diam., cristate with thick ridges; girdle obscure. Microspores brown in mass, 25–35 μm, spinulose. 2n = 44.


Phenology: Spores mature winter–early spring.
Habitat: Creeks

Discussion

Isoëtes louisianensis is known from drainage streams in St. Tammany and Washington parishes in southeastern Louisiana. Based on the reticulate texture of the megaspore, it is possible that I. louisianensis represents an allotetraploid with I. engelmannii as one of its parents. Isoëtes louisianensis may represent I. engelmannii x melanopoda (B. M. Boom 1982). Spores are uniform in size and texture and readily germinate in culture.

Of conservation concern.

Selected References

None.

Lower Taxa

None.