The liverwort genera (Bryophyta: Hepaticae and Anthocerotae) of Britain and Ireland

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L. Watson and M. J. Dallwitz

Conocephalum Hill corr. Wiggers

Gametophyte. Plants thalloid, not leafy (with a strong fungal aroma, the surface conspicuously reticulate). Acrogynous (in that the 2–5 cm stalked female receptacles are terminal). Rhizoids of two kinds, smooth and tuberculate.

The cells of the gametophyte with numerous small chloroplasts. The thallus branching dichotomously; without a conspicuous conducting strand; with ventral scales (sparse, in one row on either side of the midrib, narrowly triangular with a violet, more or less rounded appendage); without gemma-receptacles; with conspicuous dorsal pores. The pores elevated, simple. The thallus containing conspicuous cavities. The air chambers in a single layer in section. The ventral surface green, or reddish brown.

The plants dioecious.

The gametangia and capsules borne externally. The gametangia borne on special ‘receptacles’. The female receptacles stalked (the stalk 2–5(-6) cm, with one rhizoid furrow); more or less entire. The male receptacles discoid, sessile.

Sporophyte. The sporophyte elevated by elongation of the seta, with no intercalary meristem. The capsule dehiscing via a lid (and 4–8 valves). Elaters present; bispirally thickened to thickend via 3–4 spirals; free (short, thick, brown, simple).

British representation. 1 species (C. conicum); England, Wales, Scotland, and Ireland.

Classification. Class/Division Hepaticae. Subclass/Class Marchantiidae. Order Marchantiales. Family Conocephalaceae.

Illustrations. • C. conicum: Jameson, in Macvicar (1926). • C. conicum: Pearson fig. CCIX.jpg (1902). • C. conicum: Pearson fig. CCIX.jpg legend.

To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2005 onwards. The liverwort genera (Bryophyta: Hepaticae and Anthocerotae) of Britain and Ireland. Version: 24th February 2016.’.