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Published In: Prodrome des Cinquième et Sixième Familles de l'Aethéogamie 57. 1805. (Prodr. Aethéogam.) Name publication detail
 

Project Name Data (Last Modified On 3/23/2011)
Acceptance : Accepted
Project data     (Last Modified On 3/23/2011)
Discussion: Fissidens dubius, a widespread species in the Northern Hemisphere, reaches its southernmost New World distribution in Honduras. The species is distinguished by its lighter colored, irregularly serrate leaf margins, irregularly bistratose laminal cells and lateral sporophytes. Fissidens bourgaeanus also has irregularly bistratose laminal cells and often irregularly serrate margins; however, it is a larger plant and the leaf margins are usually darker in color. Fissidens dubius is related to F. subbasilaris, which differs in having the distal end of the costa obscured by chlorophyllose cells. Fissidens subbasilaris has not been reported from Central America but is known from two states in Mexico.
Illustrations: Grout (1936, Pl. 6); Jennings (1951, Pl. 15); Breen (1963, Pl. 1 5–6); Crum and Anderson (1981, Fig. 36 F–M); Ireland (1982, Pl. 49); Iwatsuki and Suzuki (1982, Figs. 6 2, 8 1–3; Pls. 46–47); Crum (1983, Fig. 17 C–E); Reese (1984, Fig. 15 G–J). All figures cited as F. cristatus.
Habitat: Soil over tree bark; 1300 m.
Distribution in Central America: GUATEMALA. Alta Verapaz: Richards et al. 2854 (PAC); HONDURAS. Comayagua: Standley 56201 (FH); COSTA RICA. Puntarenas: Crosby 3602 (MO).
World Range: Eastern Canada, North-Central, South-Central, Northeastern, Southeastern, and Southwestern U.S.A.; Mexico; Central America; Northern, Southwestern, Middle, East and Southeastern Europe; Caucasus, Western Asia, China, Soviet Far East, Eastern Asia; Indian Subcontinent, Malesia.

 

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Fissidens dubius P. Beauv., Prodr. Aethéogam. 57. 1805. Type. United States of America, s. coll. (GL).

Fissidens cristatus Wils. ex Mitt., J. Linn. Soc., Bot. Suppl. 1: 137. 1859. Type. India, Hooker & Thompson s.n. (BM).

Plants to 2.5 cm × ca. 3.5 mm. Leaves to 3.5 mm × ca. 0.7 mm; apex obtuse to acute, often apiculate; margins crenulate-serrate at apices, elimbate; vaginant laminae more or less 2/3 the leaf length, unequal, minor laminae acute; costa percurrent to ending a few cells below apex; cells 7–10 µm, irregularly bistratose, smooth but bulging, rounded-hexagonal. Sporophytes lateral.
 

 

 
 
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