Selaginella arenicola subsp. acanthonota (Underw.) R.M. Tryon:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

Fla., Ga., N.C., S.C.

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Plants terrestrial, less often on rock, forming close clumps. Stems radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked; rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight; rhizomatous stems with budlike branches, these sometimes inconspicuous; aerial stems erect or ascending, lateral branches conspicuously determinate. Rhizophores borne on upperside of stems, restricted to rhizomatous stems or lowermost base of aerial stems (seldom on distal 2/3, if so, short), mostly aerial, 0.25--0.43 mm diam. Leaves monomorphic, in pseudowhorls of 4 or 5, tightly appressed, ascending, green, narrowly triangular-lanceolate or narrowly lanceolate, 2--3.25 X 0.4--0.6(--0.7) mm; abaxial ridges present; base rounded to cuneate, slightly decurrent to adnate, pubescent; margins ciliate, cilia transparent, spreading at base, dentiform, ascending toward apex, 0.02--0.1 mm; apex plane, attenuate or seldom slightly keeled; bristle white or whitish to transparent, sometimes with brownish to reddish band at base marking breaking point (in old leaves), straight, puberulent, (0.35--)0.5--1.4 mm. Strobili solitary, (0.5--)1--3(--3.5) cm; sporophylls ovate-lanceolate to lanceolate, abaxial ridges not prominent, base pubescent, margins ciliate, apex bristled.

Selaginella arenicola L. Underwood subsp. acanthonota (L. Underwood) R. M. Tryon; S. floridana Maxon; S. funiformis Van Eseltine; S. humifusa Van Eseltine; S. rupestris (Linnaeus) Spring var. acanthonota (L. Underwood) Clute

Holotype for Selaginella humifusa Van Eselt.
Catalog Number: US 228293
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): G. V. Nash
Year Collected: 1894
Locality: Vicinity of Eustis, Lake County, Lake, Florida, United States, North America

Holotype for Selaginella funiformis Van Eselt.
Catalog Number: US 723895
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): C. T. Mohr
Year Collected: 1898
Locality: Carabelle., Franklin, Florida, United States, North America

Type fragment for Selaginella acanthonota Underw.
Catalog Number: US 867141
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): C. Williamson
Year Collected: 1892
Locality: North Carolina, United States, North America

Pine barrens, sand pine-oak scrubs, dry sandy hill or dunes, open white sandy soil, white sand, or sandstone rock; 0m.

Rounded Global Status Rank: T4 - Apparently Secure

United States

Rounded National Status Rank: N4 - Apparently Secure

Selaginella acanthonota is a member of the S . arenicola complex, a taxonomically difficult group. Specimens of S . acanthonota from the northern part of its range (e.g., North Carolina, South Carolina, and Georgia) tend to have rather prostrate underground (rhizomatous) stems, with ascending to erect, short aerial stems. Those from Florida have rather ascending underground (rhizomatous) stems and more slender aerial stems. Selaginella acanthonota , in addition to features given in the description, is characterized by having hairs running lengthwise along or at least to the proximal half of the ridges bordering the abaxial groove of the leaves and sporophylls, and, usually, puberulent leaves and sporophyll apices. The hairs on the ridges sometimes break off easily or are somewhat enclosed within the abaxial groove (when the ridges close as a response to dryness), but they can be seen under a microscope. More systematic studies are needed within S . acanthonota and the entire S . arenicola complex.

Comments: Kartesz's 1999 checklist accepts this as a separate species, Selaginella acanthonota.