Abstract
Plants submerged or emerged; stems up to 20 cm in length, 0.2–0.35 mm in diameter, ends of foliated stems and branches commonly curved, frequently uncinate; leaves tristichous, carinate-condupli-cate, costate, unfolded blades oblong-lanceolate, narrowly lanceolate to lanceolate-subulate, often subsecund or secund, frequently falcate to uncinate, some straight along keel, others with keel moderately to strongly curved; apices subobtuse, obtuse, subulate, or acuminate, leaf tips entire, subserrulate, serrulate, or sinuolate; median cauline blades 2.75–7 mm long, 0.4–1.4 mm wide, 3–11 : 1; costa subpercurrent, percurrent, or briefly to long excurrent; median cells of leaves linear-rhomboidal or linear with ends attenuate; alar cells indistinct, not enlarged to very slightly so; auricles none; dioecious; perichaetial branch 4–10 mm long; perichaetium narrowly cylindrical, 0.25–0.65 mm in diameter; inner perichaetial leaves linear, narrowly lanceolate, or narrowly ovate-lanceolate, convolute to tubular, subspirally to spirally enveloping the seta, apices acute to long acuminate, entire, subserrulate, or serrulate; calyptra long conical, dimidiate, enveloping the capsule, when young clasping seta by base, usually free when mature, 1.75–6.5 mm in length;
Dichelyma Myr., in Act. Reg. Acad. Sci. Holm. 1832: 274. 1833.
Neckera, Sect. 9 Dichelyma, Subsect. 1 Eudichelyma C. Müll., Syn. Musc. 2: 143. 1850.
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References
Preceding 1801, the priority date of Muscineae, Dillenius, in 1741, in Hist. Muse, p. 260, published the polynomial, Fontinalis capillacea, calycibus stilt instar cuspidatis for the plants collected by Bartram in a lake in Pennsylvania. Linnaeus, in Fl. Suec, in 1755, p. 379, indicated the binomial, Fontinalis capillacea, based upon the polynomial of Dillenius. Dickson, in 1790, in Pl. Crypt. Brit., Fase. 2, p. 1, used the name, Fontinalis capillacea, based upon the binomial of Linnaeus. Hedwig did not use the name, Fontinalis capillacea, in Species Muscorum, 1801. Withering, in Systematic Arrangement of British Plants 3: 773. 1801, used the name, Fontinalis capillacea, based upon the Fontinalis capillacea of Dickson and of Dillenius. Myrin transferred the name, Fontinalis capillacea, to the genus, Dichelyma. Bruch and Schimper discovered that the plants which served as the basis of Myrin’s D. capillaceum were not the same as those formerly known to be Fontinalis capillacea. According to Art. 54 of the Int. Rules of Bot. Nom. (1935), Dichelyma capillacea (With.) Myr. emend. Bruch and Schimper would appear to be the correct citation for this species.
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Welch, W.H. (1960). Dichelyma. In: A Monograph of the Fontinalaceae. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-6339-4_9
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DOI: https://doi.org/10.1007/978-94-017-6339-4_9
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