Monographs Details: Liagora mucosa M.Howe
Authority: Britton, Nathaniel L. & Millspaugh, Charles F. 1920. The Bahama Flora.
Family:Liagoraceae
Scientific Name:Liagora mucosa M.Howe
Description:Species Description - Thallus very soft and mucous, lightly and irregularly calcified, 5-20 cm. long or high, irregularly monopodial, the main divisions paniculate or pyramidopaniculate, the calcification beginning near the central axis and often extending into the extra-peripheral mucus as mostly isolated flocculent granules, the surface in dry state pulverulent, farinaceous, or sometimes minutely alveolate; branches for the most part progressively shorter, varying from rather sparse to moderately crowded, tapering slightly to obtuse or subacute apex, 0.32-0.6 mm. broad towards apex (not including hairs) ; central axis in basal parts 0.7-1.25 mm. in diameter, lightly calcified, often denudate, in ultimate branches mostly 45-125 µ in diameter, readily visible, commonly reduced to three or four rather easily separable filaments towards apex, the cells subcylindric or fusiform, mostly 52-300 µ X 1175 u, descending rhizoids 3-8 /jl in diameter few in younger parts; fascicles of assimilatory filaments mostly 150-300 µ long, 3 or 4 times dichotomous, intermingled in older parts with simple or subsimple filaments 8-15 cells long, all beautifully moniliate or submoniliate in distal parts at least, the distal or subdistal cells suhglobose or bitruncate-subglobose to ellipsoid or obovoid, 13-24 µ long, 13-19 µ broad ; apical hairs very numerous, becoming 300-800 µ long, eylindric-capitate, gelatinizing and leaving inconspicuous vestigia; dioicous; antheridia forming rather compact subglobose or subhemispheric tufts 25-50 n broad, crowning ultimate and penultimate segments; carpogonial branch slightly curved, 15-28 µ broad, of four cells (often with conspicuous intercellular spaces), situated latero-terminally on the second or third (rarely first or fourth) segment of the fascicle; cystocarp compact, subhemispheric or subglobose, 100-200 µ broad, with a few rather inconspicuous ascending involucral filaments; carpospores obovoid to pyriform-clavate, 25-32 µ X 14-18 µ.

Discussion:

On more or less exposed rocks, at or near the low-water mark (also found washed ashore). Little Inagua {Howe 5717 type), Rose Island, Whale Cay, Great Stirrup Cay, Great Bahama : Florida (Key West, Mrs. G. A. Hall, Mrs. F. A. Curtiss) ; Barbados (Vickers, Alg. Barb. 106 a coarse form). Liagora mucosa resembles L. pedicellate so much in general habit that a microscopic examination is commonly necessary for their distinction, yet it differs constantly in being dioicous, in the larger tufts of antheridia, in the less distal and more lateral insertion of the more curved carpogonial branch, and in the presence of a proper, even though rather inconspicuous, ascending involucre for the cystocarp. It differs less constantly in the shorter, more moniliform assimilatory filaments and in the more axial, less extra-peripheral calcification.

From Liagora pinnata Harv., the species differs in being dioicous, in being less calcified, in its greater mucosity, in its shorter, more moniliform assimilative filaments, etc. From Liagora mcgagijna Borg., recently described from St. Croix, L. mucosa differs in being much more flaccid and mucous, in being less calcified, in the long and numerous apical hairs, in the fascicles of the more moniliate assimilatory filaments being about one half as long, in the absence of rhizoidal trichomes on the assimilatory filaments (except for the decurrent rhizoid springing from the basal segment i, in the more curved, usually less stout, and more proximally situated carpogonial branches, etc.

Distribution:Grand Bahama Bahamas South America| Barbados South America|