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FNA | Family List | FNA Vol. 2 | Isoëtaceae | Isoëtes

Isoëtes lithophila N. Pfeiffer, Ann. Missouri Bot. Gard. 9: 135. 1922.

Rock quillwort

Plants becoming terrestrial. Rootstock nearly globose, 2-lobed. Leaves deciduous, bright green, pale toward base, spirally arranged, to 12(--20) cm, pliant, gradually tapering to tip. Velum covering entire sporangium. Sporangium wall unpigmented. Megaspores light gray to gray-brown, 290--360 μm diam., obscurely rugulate with low ridges; girdle obscure. Microspores brown in mass, 30--33 μm, tuberculate to spinulose. 2n = 22.

Spores mature in winter or spring. Shallow depressions on granite outcrops; of conservation concern; Tex.

Isoëtes lithophila is known from granite outcrops in Burnett, Mason, and Llano counties in south central Texas.


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