Monographs Details: Spermothamnion speluncarum (Collins & Herv.) M.Howe
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
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.
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)
Grand Bahama Bahamas South America
| Ragged Island Bahamas South America
| Bermuda South America