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FNA | Family List | FNA Vol. 2 | Selaginellaceae | Selaginella

13b. Selaginella arenicola subsp. riddellii (Van Eseltine) R. M. Tryon, Ann. Missouri Bot. Gard. 42: 24. 1955.

Riddell's spike-moss

Selaginella riddellii Van Eseltine, Contr. U.S. Natl. Herb. 20: 162. 1918

Leaves (aerial stems) usually loosely appressed; base often glabrescent. Strobili sometimes with apical vegetative growth, not distinctly larger than subtending stem. Sporophylls usually not abruptly tapering toward apex; apex straight.

Mostly on granite outcrops, granite boulders, or gravelly or sandy soil; 0--200 m; Ala., Ark., Ga., La., Okla., Tex.

The specimens of Selaginella arenicola subsp. riddellii from Texas are more constant in their morphologic characteristics and thus more easily separated from subsp. arenicola .


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