BFNA Title: Chonecoleaceae
CHONECOLEACEAE Schuster ex Grolle
Plants forming thin mats; branches from axils of leaves; without flagella. Leaves alternate, succubous, plane, bilobed, entire; underleaves minute or absent, unlobed. Rhizoids scattered over ventral stem. Specialized asexual reproduction by caducous perianths. Gynoecium terminal on an ordinary leafy branch. Perianth without subfloral branches, well developed, campanulate, mouth wide, weakly plicate near mouth, smooth below, perigynium absent.
Genera 1, species 2 (1 genus, 1 species in the flora): North America (Florida); South America.
1. CHONECOLEA Grolle, Rev. Bryol. Lichénol. 25: 294. 1965 * Greek chonos, funnel, and coleus, sheath, alluding to shape of perianth
Plants green, with no secondary pigmentation, branching profusely; stems lacking internal differentiation; rhizoids numerous. Leaves as long as wide, bilobed about 1/3, lobes more or less equal in size; oil-bodies present in all leaf cells. Underleaves (when present) awl-shaped. Sexual condition monoicous; male branches lateral, each bract containing a single large antheridium, antheridial stalk uniseriate. Gynoecia terminal, bracts not or barely differentiated from leaves, bracteole absent. Sporophyte seta elongate, differentiated internally, 8 cells in outer row, surrounding 4 inner cells, seta not articulate; capsule spherical, valves straight. Elaters with 1 spiral. Spores minutely reticulate.
Species 2 (1 in the flora): North America (Florida); South America; Australia (possibly introduced).
Jungermannia doellingeri Nees, Syn. Hepat., 104. 1844
Plants minute, in dense patches. Shoots 0.4--0.8 mm wide. Leaves contiguous to barely imbricate, about as wide as long, lobes broadly triangular; margins entire to crenate; leaf cells thin-walled, lacking trigones and intermediate thickenings; oil-bodies 20--30 per cell in mid-leaf, colorless, single. Underleaves best developed near apex of stem, often absent. Androecia with male bracts unequally bilobed, somewhat conduplicate, concave at base and loosely imbricate, occurring in 2-6 pairs. Perianths exserted, bell-shaped, smooth, with 4--5 obtuse, rounded keels near an open truncate apex.
Shaded trunks of palm trees in low moist forests, often occurring with the moss Octoblepharum albidum along Atlantic and Gulf Coastal Plains of Florida, 0--20 m; South America Australia (possibly introduced).
When sterile and without oil-bodies, Chonecolea is practically inseparable from Cylindrocolea rhizantha (Mont.) R. M. Schust. of the Cephaloziellaceae. Mature fertile plants of each species can be separated on the basis of the spore markings. The spores of Chonecolea are reticulate while those of Cylindrocolea rhizantha are smooth. Fresh sterile plants of Chonecolea have 20--30 minute oil bodies per midleaf cell, whereas Cylindrocolea rhizantha has 4--8 round, finely papillose oil bodies per midleaf cells.
SELECTED REFERENCES Schuster, R. M. 1980. Chonecolea. In R. M. Schuster. 1966--1993. Hepaticae and Anthocerotae of North America East of the Hundredth Meridian. New York. 4: 321--325.