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Article
Published: 2021-10-04

Chiastocaulon raetzelii (Marchantiophyta, Plagiochilaceae), a new species from New Caledonia

Frank Müller, Technische Universität Dresden, Institut für Botanik, Mommsenstr. 13, 01062 Dresden, Germany
Louis Thouvenot, 11 rue Saint Léon, 66000 Perpignan, France
Chiastocaulon liverworts New Caledonia Pacific Islands Plagiochilaceae Bryophytes

Abstract

The new liverwort species Chiastocaulon raetzelii is described from New Caledonia. Chiastocaulon raetzelii is characterized by very fragile, caducous leaves, stems therefore often becoming completely denuded of leaves; only bract leaves of the androecia are permanent and often the only ones remaining on the stem. Plants are minute with leafy shoots to 1 mm wide. Leaves on leafy shoots are arranged in opposing pairs, they are obovate-truncate to spathulate, with 3–7 teeth per leaf, teeth are filiform, consisting of long rectangular cells, and occupy about 1/3 to 1/4 of the entire leaf length. The species is compared to C. oppositum and C. geminifolium, which are the most similar morphologically.

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