ON THE RELATIONSHIPS OF THAMNOBRYUM NEGROSENSE (BARTR.) IWATS. & TAN (MUSCI: THAMNOBRYACEAE)

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  Thamnobryum negrosense (Bartr.) Iwats. & Tan, a species originally described as Thamnium negrosense Bartr. from the Philippines, is re-described and illustrated. It shows closer affinities to Th. ellipticum (Bosch. & Lac.) Schu.-Mot. than to any other species of Thamnobryum in, among other things, the strongly complanate foliage, the lack of leaf dimorphism, crenulate to minutely serrulate leaf margins at the apex, and multistratose leaf margins. Partially bistratose limbidia are described and illustrated for the first time in Th. ellipticum. Th. negrosense and Th. ellipticum are placed in the new subgenus Parathamnium (Fleisch.) Ochyra stat. & comb. nov. within Thamnobryum, for which Th. ellipticum is chosen as the lectotype.