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Published In: Journal of the Linnean Society, Botany 12: 45. 1869. (J. Linn. Soc., Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/11/2011)
Acceptance : Accepted
Note : Rhamphidium has been placed in the Dicranaceae (Mitten 1869), Pottiaceae (Brotherus 1901, 1925, Walther 1983, Vitt, 1984, Norris & Koponen 1989, Eddy 1990, Zander 1994a), Rhabdoweisiaceae (Fleischer 1923) or Ditrichaceae (Hilpert 1933, Zander 1993, Churchill & Linares 1995, Buck & Goffinet 2000). The placement of Rhamphidium in the Pottiaceae is based on an interpretation of its peristome as consisting of 32 filiform, densely spiculose teeth on a short basal membrane. The peristome of Rhamphidium is considered here a minor variation of the standard dicranoid peristome in which the 16 teeth are united at base (a feature found also in, e.g., Dicranella or Dichodontium) and each tooth is cleft unusually deep (the cleft reaches to the basal membrane). The only unusual feature of the Rhamphidium peristome not encountered in the Dicranaceae is the densely spiculose ornamentation on the teeth. Although very deeply cleft, the peristome teeth of Rhamphidium are not divided to the base, and for that reason the genus is not placed in the Ditrichaceae. Within the Dicranaceae Rhamphidium appears close to Dichodontium. The two genera have nearly identical leaf morphologies and very similar sporophytes. Dichodontium differs from Rhamphidium in having leaf cells that are more consistently papillose to mammillose on both sides of the leaf cells, and peristome teeth that are not as strongly united at base, less deeply cleft and vertically striate-papillose above.

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Rhamphidium Mitt., J. Linn. Soc., Bot. 12: 45. 1869.

Trichostomum subg. Rhamphidium (Mitt.) Besch., Ann. Sci Nat., Bot. sér. 6, 3: 198. 1876.

Plants small, caespitose to gregarious, terricolous or saxicolous, irregularly branched with rhizoids scattered on stems. Stems with central strand and sclerodermis present. Leaves lanceolate to ovate from a broad, sheathing base; apices obtuse to broadly acute; margins plane, erect or incurved; costa subpercurrent to percurrent, guide cells and two stereid bands present, ventral surface layer somewhat enlarged, bulging; upper cells irregularly quadrate, hexagonal, to short-rectangular, strongly bulging on the ventral surface, not or somewhat bulging on the dorsal surface, at times unipapillose, basal cells long-rectangular, firm-walled, alar cells not differentiated. Dioicous. Setae smooth, red. Capsules exserted, short-cylindric to ellipsoid, inclined; stomata present at base; opercula long, slenderly rostrate; annuli persistent; peristome teeth 16, reddish orange, united at base into a short basal membrane, each tooth divided to the basal membrane into two, densely spiculose to spirally ridged filaments. Spores smooth or granulate. Calyptrae cucullate.

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