Bonnemaisonia asparagoides (Woodward) C. Agardh
Description: Gametophyte (above) with feathery fronds,
much branched, to 250 mm long, main axis cylindrical or slightly
compressed, to 3 mm wide, from small discoid base. Branches
alternate, distichous, covered with alternating, spinelike
corticated ramuli about 2 mm long in one plane. Tetrasporophyte
a minute prostrate disc 2-4 mm diam.
Habitat: The gametophytes are summer annuals
(May-September) found on rock, very low intertidal or subtidal
(to 30 m in Britain and Ireland), widely distributed, frequent
in the subtidal. Sporophyte subtidal, on shells, stones, etc.,
very rarely found.
Similar species:
Bonnemaisonia hamifera
is less common and more seasonal (March to June, inclusive, and
has distinctive and unique crozier-shaped modified branches that
hook on to other algae; Naccaria wiggii even less common
and has branchlets that grow radially on the axes.
Key characteristics: Short, almost spiny branchlets in
two rows; specimens also degenerate very quickly unless kept in
large amounts of seawater and in a cool place.
Link:
Algaebase
Species list
Photograph © Bernard Picton, Ulster Museum
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