
Thursday 15 February
The World's Favourite Unloved Species 2018 - the Galapagos Racer
Kingdom | Plantae |
Phylum | Hepatophyta |
Class | Hepatopsida |
Order | Jungermanniales |
Family | Cephaloziellaceae |
Genus | Cephaloziella (1) |
This liverwort has a leafy appearance with yellowish-green, dark red-brown or black shoots that either lie along the ground or are raised upwards (3). The shoots support leaves that have toothed edges (3). Although this species is minute, it can often develop into fairly sizable patches (3). It is very similar in appearance to the related species Cephaloziella nicholsonii, and only detailed examination can distinguish the two (3). Cephaloziella nicholsonii is often larger, up to 15 mm long, is more fertile and produces asymmetrical gemmae, whereas Cephaloziella massalongi produces symmetrical gemmae (2).
Liverworts, hornworts and mosses form a group of plants called bryophytes (3). Bryophytes lack many of the more complex structures of the higher plants, such as a vascular system, and flowers. They do not have roots, instead they have structures called 'rhizoids' which absorb water and anchor the plant to the substrate. In liverworts these rhizoids each consist of a single elongated cell (4). Bryophytes have an interesting life cycle, which consists of two main stages, called the gametophyte and sporophyte generations, the gametophyte generation is dominant. In the UK, Cephaloziella massalongi reproduces by producing special groups of cells called 'gemmae' (3) which develop into new plants (4). This species often occurs with C. nicholsonii, but it appears to be less resistant to dry conditions than the latter (3).
In Great Britain this liverwort is known only from the south-west of England and north Wales, and is locally abundant at a number of sites in Cornwall and Devon (3). Elsewhere it has a wide distribution, occurring in north-western Europe, where it is classified as rare, and in the southern Appalachian Mountains in the USA (3).
Typically grows around copper mines or other copper-enriched habitats in damp acidic soil, on walls, rocks, and mine-spoil (3).
Classified as Vulnerable in Great Britain (3).
Most of the sites that support this species are unprotected; just two occur within designated Sites of Special Scientific Interest, one in Cornwall, and the other in Wales (3). Site protection has been proposed for the strongest populations (3).
Information authenticated by Royal Botanic Gardens, Kew:
http://www.rbgkew.org.uk/
Image credit
© British Bryological Society / National Museum & Gallery, Cardiff
National Museum & Gallery, Cardiff
Cathays Park
Cardiff
CF10 3NP
United Kingdom
biosyb@nmgw.ac.uk
http://www.nmgw.ac.uk/nmgc/
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This species is featured in:
Thursday 15 February
The World's Favourite Unloved Species 2018 - the Galapagos Racer
Thursday 01 February
Thursday 01 February