Monographs Details: Spermothamnion speluncarum (Collins & Herv.) M.Howe
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Wrangeliaceae
Description:Species Description - Variable in length of cells and thickness of the cell-walls; cells mostly 2-4 times as long as broad, but occasionally as much as 8 times; cell-walls usually 3-6 u. thick, but ranging up to 12 n thick ; tetrasporangia occurring mostly on the lower part of the main erect filaments, solitary or rarely two (opposite) on a segment, ellipsoid or subglobose, 52-65 µ in maximum diameter, subsecund, sessile or on 1- or 2-celled pedicels; antheridial stands terminal, short-cylindric or ovoid-ellipsoid, about 40 µ X 20-28 µ Erect filaments sometimes tortuous and intricate, forming intertangled cushions. Eelated to the North-European S. roseolum (Ag.) Pringsh., especially to the form occasional in herbaria under the name Callithamnion repens Lyngb.,but filaments more intricate and flexuous, more slender (commonly 22-39 µ vs. 35-55 m), cells shorter (usually 2-4 times vs. 3-8 times as long as broad), more often dolioform, and more often collabent.

Discussion:

Under shelving rocks and on various algae (Chamaedoris, Galaxaura, Jania, etc.) and on sponges, in shaded situations, near low-water mark, Rose Island, Great Bahama, North Cat Cay, Mariguana, and Great Ragged Island: Bermuda. Type (sterile) from Bermuda.

Distribution:Grand Bahama Bahamas South America| Ragged Island Bahamas South America| Bermuda South America|