Monographs Details: Leptostomum exodontium M.Fleisch.
Authority: Buck, William R. 1987. Bryostephane Steereana: A Collection of Bryological Papers Presented to William Campbell Steere On The Occasion of His 80th Birthday. Mem. New York Bot. Gard. 45: 1-749.
Description:Distribution and Ecology - Collection studied: PHILIPPINES. Mindanao: on tree trunk, ca. 2200 m, Mt. Kitanglad, Malaybalay, Bukidnon Province, 25-27 May 1984, Tan, Navare & Amoroso 84-350.
The long and somewhat crenulate hairpoint, involute leaf margin, decurrent leaf base and the "herzformig" leaf apex identify the Philippine plants undoubtedly as Leptostomum exodontium (Heischer, 1900-1923).
The stem is thickly matted with rhizoids. Its cross section reveals a large central strand. The leaf costa consists of large, ventrally located guide cells and a small group of dorsal stereids. The leaf areolation is mniod-like although its habit is bryoid. Its placement in a separate family, Leptostomataceae, positioned between Bryaceae and Mniaceae by Fleischer (1900-1923) is perhaps jusrified. The record ofthe genus and family are new additions to the Philippine moss flora.
Koponen and Norris (1985) recently remarked that for southwestem Asia and Malesia there is only one widespread species, Leptostomum densum Mitt. & Thwait. It is not clear if they considered L. exodontium as a synonym of L. densum.
Sainsbury (1955) commented that the distribution of the genus (except for the presently reported extension to the Philippines) is confined to the Southem Hemisphere.