Schizymenia dubyi (Chauvin ex Duby) J. Agardh
Crustose phase known as Haematocelis rubens J.
Agardh
Description: Gametophytes: soft and fleshy,
brownish-red fronds, 500 mm long, 250 mm broad, irregularly
split or lobed, rarely proliferous, with a very short (2-3 mm)
stipe from a minute attachment disc. Tetrasporophyte
(Haematocelis-phase): thick fleshy crust; difficult to identify
and rarely reported.
Habitat: Gametophytes are found in
mid-intertidal, large pools and the shallow subtidal (0-5 m),
annual, developing in spring; south-western and western coasts
of Britain and Ireland north to St Kilda, uncommon;
tetrasporophytic crusts are apparently exclusively found in the
shallow subtidal.
Similar species: Dilsea carnosa is
much thicker, commoner, and more cartilaginous, has
rounded-spathulate blades, and several blades arise from a
relatively large basal disk;
Halarachnion ligulatum
is thin and filmy, never fleshy;
Kallymenia reniformis
is commoner in the subtidal generally lobed and the lobes are
frequently kidney-shaped.
Key characteristics: Fleshy frond, lack of
lobing and, generally, marginal proliferations; when dried onto
paper the fertile fronds feel like fine sandpaper to the the
touch.
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