Monographs Details: Acanthocoleus juddii Kruijt
Authority: Gradstein, S. Robbert. 1994. Lejeuneaceae: Ptychantheae, Brachiolejeuneae. Fl. Neotrop. Monogr. 62: 216. (Published by NYBG Press)
Family:Lejeuneaceae
Description:Species Description - Paroicous. Plants up to 2 cm long × 2 mm wide, green to brown. Stems ca. 0.15 mm in diam., in cross section composed of 10-12 epidermal cells surrounding 25-40 medullary cells, dorsal epidermal cells slightly larger than ventral epidermal cells; ventral merophyte 2 cells wide. Leaves imbricate, dorsal lobe orbicular, 0.6-0.9 mm, apex apiculate, occasionally rounded, margins entire, ventral margin forming a straight line or wide angle (150-180°) with the keel; median cells 30-40 × 25 m long, oil bodies not observed. Lobules (sub)rectangular, 0.4-0.6 × 0.2-0.4 mm, l/2-2/3× lobe length, occasionally reduced, keel straight, free margin with 1-2 teeth separated from each other by 3-6 margin cells, first tooth large, triangular, 3-6 cells long and 2-4 cells wide at base, the tip inflexed, second tooth small, 1-2 cells long, sometimes obsolete. Underleaves distant to subimbricate, 0,2-0.4 mm, 2-3× stem width, insertion line arched. Androecia located on main stem or branches directly below the gynoecium, bracts in 2-4 series, almost similar to leaves, lobules somewhat more inflated, bracteoles not smaller than underleaves; one antheridium per bract. Gynoecia with two innovations, bract lobes narrow oblong, up to 0.8 mm long, apex acute-apiculate, margins entire, lobule up to l/3× lobe length, sometimes reduced; bracteoles ca. 0.7 mm long, plane. Perianths up to 1 mm long, emergent to 1/2, with three keels: 2 sharp lateral keels and one broad rounded keel, the lateral keels winged in the upper 1/3 and with 2-6 teeth, the ventral keel smooth; beak 3-4 cells long.

Discussion:Acanthocoleus juddii is a well-defined species, separated from its congeners by its large, rectangular lobules with very conspicous teeth, and by the broad, orbicular leaf lobes.

Illustrations: Kruijt, Bryophyt. Bibl. 36:95, Pl. 12.1988.

Distribution:Mexico North America| Cuba South America| Santiago de Cuba Cuba South America| Villa Clara Cuba South America| Haiti South America|