Monographs Details:
Authority:
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Family:
Lycopodiaceae
Lycopodiaceae
Description:
Species Description - Plants 15–55 cm long, pendent from arching bases, 2–6 times dichotomous, the primary divisions often widely divaricate (45– 90º), the distal divisions usually divergent at smaller angles; stems 1.5–3.5 mm diam. (without leaves), stramineous to light brown; leaves spirally arranged in many ranks, spreading (especially the basal ones) to ascending, linear-subulate, proximal leaves 1.5–2 cm x 0.8–1 mm, entire, papyraceous, often subfalcate, midribs raised abaxially; sporophylls reduced to 8–15 x 0.5 mm, otherwise similar to vegetative leaves, not expanded at bases; sporangia visible; 2n = ca. 264 (PR).
Species Description - Plants 15–55 cm long, pendent from arching bases, 2–6 times dichotomous, the primary divisions often widely divaricate (45– 90º), the distal divisions usually divergent at smaller angles; stems 1.5–3.5 mm diam. (without leaves), stramineous to light brown; leaves spirally arranged in many ranks, spreading (especially the basal ones) to ascending, linear-subulate, proximal leaves 1.5–2 cm x 0.8–1 mm, entire, papyraceous, often subfalcate, midribs raised abaxially; sporophylls reduced to 8–15 x 0.5 mm, otherwise similar to vegetative leaves, not expanded at bases; sporangia visible; 2n = ca. 264 (PR).
Discussion:
Lycopodium dichotomum Jacq., Enum. Stirp. Vindob. 314. 1762. Urostachys dichotomus (Jacq.) Herter, Beih. Bot. Centralbl. 39: 249. 1922. Lectotype (Proctor 1977: 28). Jacquin, Hort. Bot. Vindob. 3: t. 45. 1776, illustrating a plant from Martinique.
This species is very similar to H. wilsonii, but that species has much narrower leaves that are more widely spreading.
Distribution:
Mexico North America| Paraguay South America| Bolivia South America| Amazonas Brazil South America| Peru South America| Galápagos Islands Ecuador South America| Amazonas Ecuador South America| French Guiana South America| Trinidad and Tobago South America| Venezuela South America| West Indies| Panama Central America| Costa Rica South America| Nicaragua Central America| El Salvador Central America| Honduras Central America| Belize Central America| Guatemala Central America|
Mexico North America| Paraguay South America| Bolivia South America| Amazonas Brazil South America| Peru South America| Galápagos Islands Ecuador South America| Amazonas Ecuador South America| French Guiana South America| Trinidad and Tobago South America| Venezuela South America| West Indies| Panama Central America| Costa Rica South America| Nicaragua Central America| El Salvador Central America| Honduras Central America| Belize Central America| Guatemala Central America|