Marchesinia mackaii

Marchesinia mackaii
Scientific classification
Kingdom:	Plantae
Division:	Marchantiophyta
Class:	Jungermanniopsida
Order:	Porellales
Family:	Lejeuneaceae
Genus:	Marchesinia
Species:	M. mackaii
Binomial name
	Marchesinia mackaii; (Hook.) S.F.Gray

Marchesinia mackaii, or MacKay's pouncewort, is a species of leafy liverwort.

Description

Marchesinia mackaii grows in colonies of flattened worm-like shoots covering rock surfaces.

Shoots are usually black and are up to 5 cm long and 4 mm wide. The leaves are rounded with a smaller inflated and toothed postical lobe. The underleaves are round and entire.

Distribution

Marchesinia mackaii is global in its distribution.

In Europe it is strongly western and somewhat southern.

Ecology

Marchesinia mackaii grows primarily on shaded basic rocks, typically vertical faces within woodland. It can occasionally be found on trees especially European yew (Taxus baccata)

According to Ratcliffe's account of oceanic bryophytes bordering the Atlantic, M. mackaii is classified as a Southern Atlantic species.^[1] M. mackaii is consistently calcicolous in its choice of substrate.

Cultivation and uses

The plant is not known to be widely cultivated.

Gallery

Marchesinia mackaii colonies on carboniferous limestone rock, Arnside-Silverdale AONB, Cumbria, England.
Marchesinia mackaii on carboniferous limestone rock, Arnside-Silverdale AONB, Cumbria, England.

References

^ Ratcliffe, D.A. (1968), An Ecological Account Of Atlantic Bryophytes in the British Isles.

External links

Edwards, Sean R. (2012). English Names for British Bryophytes. British Bryological Society Special Volume. 5 (4 ed.). Wootton, Northampton: British Bryological Society. ISBN 978-0-9561310-2-7. ISSN 0268-8034.
Macvicar, S.M. (1926). The Student's Handbook of British Hepatics. Wheldon & Wesley Ltd. London.
Ratcliffe, D.A. (1968). An Ecological Account Of Atlantic Bryophytes in the British Isles. New Phytol 67: 365.
Smith, A. J. E. (1991) The Liverworts of Britain and Ireland. Cambridge University Press.
Watson, E. V. (1981) British Mosses and Liverworts: An Introductory Work. Cambridge University Press.

[Ratcliffe-1] Ratcliffe, D.A. (1968), An Ecological Account Of Atlantic Bryophytes in the British Isles.

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