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Published In: Öfversigt af Förhandlingar: Kongl. Svenska Vetenskaps-Akademien 21: 227. 1864. (Öfvers. Förh. Kongl. Svenska Vetensk.-Akad.) Name publication detail
 

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Discussion:

Leptodontium is the largest Pottiaceae genus (15 taxa) in Central America. It is usually found at high elevations on soil, tree trunks and acidic rocks or boulders. The genus can be recognized by its (usually) large size, yellowish green color, stems that have thick-walled cortical cells and no central strand, leaves that commonly are sheathing at base and squarrose-recurved above when wet, and sheathing perichaetial leaves. In addition the leaves of Leptodontium lack an enlarged epidermis on the ventral costal surface, and often the stem has a well-developed hyalodermis. The sporophytes of Leptodontium have erect, cylindrical capsules and reduced, smooth to weakly striate peristome teeth. Zander (1972) revised the New World species of Leptodontium.


 

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Leptodontium (C. Müll.) Hampe ex Lindb., Öfvers. Förh. Kong. Svenska Vetensk.-Akad. 21: 227. 1864.

Trichostomum sect. Leptodontium C. Müll., Syn. Musc. Frond. 1: 577. 1849. 

Plants small to robust, in loose or dense tufts or mats, green to yellowish green. Stems often tomentose, hyalodermis present or absent, central strand absent, cortical cells thick-walled. Leaves erect to spreading, twisted or crispate-contorted when dry, spreading to squarrose-recurved when wet, lingulate, oblong, oblong-, ovate- or long-lanceolate, keeled above, sheathing at base, variously decurrent; apices acute or acuminate; margins recurved at base, dentate above, sometimes bordered by lighter, thicker-walled, less papillose cells; costa subpercurrent to percurrent; upper leaf cells quadrate, hexagonal, triangular, oblate or subrectangular, papillose by simple, c-shaped, bifid, columnar, or coroniform papillae, basal leaf cells short-rectangular, rectangular, or elongate, straight-walled or porose, smooth or pluripapillose. Asexual reproduction by flagellate branches, short, stout branches with reduced leaves, or obovoid to claviform propagula on short stalks. Dioicous. Perichaetial leaves long-sheathing. Setae elongate. Capsules cylindrical, erect to somewhat curved; stomata at base of capsule; opercula conic-rostrate; peristome teeth 16, inserted, basal membrane low or absent, teeth linear, irregularly divided, reddish orange below, hyaline above, smooth to striate. Spores lightly papillose, homosporous or heterosporous. Calyptrae cucullate, smooth.

 

 
 
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