There are over 750 species of moss in Britain and they are a prominent part of the landscape on Skye. Mosses can be divided into two main morphological groups: acrocarps and pleurocarps. These are not recognised taxonomic groups, but they are very useful for identification purposes, so I have retained them in what follows.

acrocarps Upright habit. Largely unbranched. Spore capsule grows from tip of shoot.	pleurocarps Prostrate habit. Always branched, sometimes bipinnate or even tripinnate. Spore capsule does not grow from tip of shoot.
Breutelia chrysocoma	Hylocomium splendens
Mnium hornum	Rhytidiadelphus loreus

Major orders of acrocarpous mosses found on Skye

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ANDREAEALES

Andreaea rupestris

POLYTRICHALES
Pogonatum urnigerum	Atrichum undulatum	Polytrichum juniperinum

DICRANALES - Dicranaceae
Campylopus introflexus	Dicranum scoparium

DICRANALES - Ditrichaceae

Ditrichum gracile

DICRANALES - Rhabdoweisiaceae
Dichodontium palustre	Dichodontium pellucidum

DICRANALES - Fissidentaceae
Fissidens taxifolius	Fissidens taxifolius
Fissidens taxifolius

POTTIALES

Tortella tortuosa

GRIMMIALES - Grimmiaceae
Racomitrium lanuginosum	Racomitrium fasciculare	Racomitrium heterostichum

GRIMMIALES - Ptychomitriaceae
Ptychomitrium polyphyllum	Ptychomitrium polyphyllum	Ptychomitrium polyphyllum

SPLACHNALES

Splachnum ampullaceum

BRYALES - Bryaceae
Bryum capillare	Bryum pseudotriquetrum

BRYALES - Mniaceae

Mnium hornum

BRYALES - Bartramiaceae
Breutelia chrysocoma	Philonotis fontana

SPHAGNALES

Major families of pleurocarpous mosses found on Skye

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HYPNALES - Entodontaceae
Pseudoscleropodium purum	Pseudoscleropodium purum

HYPNALES - Fontinalaceae

HYPNALES - Hypnaceae
Ctenidium molluscum	Orthothecium rufescens
HYPNALES - Hypnaceae
Hypnum jutlandicum
Hypnum jutlandicum

HYPNALES - Leucodontaceae

HYPNALES - Myuriaceae

HYPNALES - Neckeraceae

Neckera crispa

HYPNALES - Thuidiaceae

Thuidium tamariscinum

HYPNALES - Amblystegiaceae

HYPNALES - Calliergonaceae
Calliergonella cuspidata	Calliergonella cuspidata

HYPNALES - Campyliaceae

HYPNALES - Lembophyllaceae
Isothecium myosuroides

HYPNALES - Brachytheciaceae
Cirriphyllum piliferum	Cirriphyllum piliferum
Eurhynchium striatum

HYPNALES - Ceratophyllaceae

HYPNALES - Plagiotheciaceae

HYPNALES - Hylocomiaceae
Hylocomium splendens
Rhytidiadelphus triquetrus	Rhytidiadelphus loreus	Rhytidiadelphus squarrosus

Useful links:

British Bryological Society