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Moss China | Family List | Moss China V. 1 | Dicranaceae

14. Dicranodontium Bruch & Schimp. in B. S. G., Bryol. Eur. 1: 157 (fas. 41. Mon. 1). 1847.


Dicranum subg. Dicranodontium (Bruch & Schimp.) Kindb., Eur. N. Amer. Bryin. 2: 186. 1897. Dicranum sect. Dicranodontium (Bruch & Schimp.) C. Müll., Gen. Musc. Frond. 277. 1900.

Plants small to large, yellowish brown to dark green, often shiny, in soft tufts. Stems erect, simple, sometimes sparsely branched, more or less radiculose below; central strand present or only weakly developed to absent. Leaves erect-flexuose to secund, lance-subulate, more or less deciduous, gradually or abruptly narrowed from a broad, somewhat auriculate base to a linear, subulate to setaceous acumen; margins often involute, subentire to serrulate below, clearly serrate above; costa broad at base, occupying ca. 1/3 – ½ the leaf base width, filling most of the subula, excurrent, often roughened or serrate at back above, with 2 stereid bands in transverse section; upper cells rectangular to linear, smooth or papillose because of projecting cells’ ends; lower cells broader close to the costa, narrower near the margins, forming a few marginal rows; alar cells usually sharply differentiated, inflated, hyaline to brownish. Dioicous or rarely autoicous. Perichaetial leaves not notably differentiated. Setae single, slender and elongate, erect-sinuose when dry, strongly curved to cygneous when moist; capsules long-exserted, erect, symmetric, oblong-cylindric, smooth when dry; opercula long-rostrate; annuli absent; peristome teeth 16, inserted slightly below the mouth, divided or perforate nearly to the base, vertically striate nearly throughout. Calyptrae cucullate, smooth, entire at base. Spores spherical, yellowish, finely papillose.

Dicranodontium consists of about 39 species in the world, with most species distributed in the Northern Hemisphere. Frahm (1997) recently revised the genus and reduced the number of species in Dicranodontium to 7. Eight species are known from China, with 2 species that were not treated by Frahm (1997).

1 Leaf margins distinctly toothed at base, subula serrulate nearly all around   1 Dicranodontium asperulum
+ Leaf margins entire at base, only serrulate in the upper third of subula   (2)
2 (1) Leaves usually up to (7-)8(-10) mm long   (3)
+ Leaves usually up to 5(-7) mm long   (5)
3 (2) Stems often dichotomously branched; costa occupying ca. 2/3 or more the leaf base width; basal leaf cells not sharply delimited from the upper cells; setae often more than 15 mm long   8 Dicranodontium uncinatum
+ Stems simple or irregularly branched; costa occupying ca. 1/3 the leaf base width; basal leaf cells sharply delimited from the upper cells; setae less than 10 mm long   (4)
4 (3) Stems simple; basal leaf cells dark, usually not porose; alar region auriculate; setae to 6 mm long, cygneous or curved when moist, straight or twisted when dry   3 Dicranodontium didictyon
+ Stems irregularly branched; basal leaf cells pellucid, porose; alar region fragile, not auriculate; setae to 10 mm long, sinuose when moist, straight when dry   7 Dicranodontium porodictyon
5 (2) Upper leaf margins entire or nearly so   4 Dicranodontium didymodon
+ Upper leaf margins serrulate or papillose   (6)
6 (5) Middle and upper stem leaves almost always with deciduous section; leaf cells and alar cells clearly thick-walled   2 Dicranodontium denudatum
+ Stem leaves more or less deciduous, not forming a distinct deciduous section; leaf cells and alar cells thin-walled or not particularly thick-walled   (7)
7 (6) Upper leaf cells distinctly papillose   6 Dicranodontium papillifolium
+ Upper leaf cells smooth or only projecting at the cell ends   5 Dicranodontium filifolium

Lower Taxa


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