A biological study of Durvillaea antarctica (Chamisso) Hariot and D ...

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internal layer of large, empty, colourless
columnar I polygonal chambers, I'fhich make the
blade cushion-like to the feel, agreeing in that
xespect with D. harveyi of the Cape Horn region and
Sa:t'crophycus potatorUJn of Tasmania and Austrcllia.
At low water, instead of sprawling on Or hanging
from the rocJ{s, as is the habit of D, antarctica I
the stipe of this new species stands erect with
the blade d.rooping from its extrem:L ty . Hence the
two species may readily be distinguished 8t a
distance."
Plant up to 10 m long.
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discoid, conical or scutate.
Never excavated by burrowing animals_ Rarely perforated. Stipe up
to 2 m long and 100 nun thick at the base.
Flexures at base
uncommon. Never recessed into holdfast. Never branched distally
into bough-like processes. Stipitate lateral laminae moreor-less
spirally along the stipe.
pseudoparenchyma, not elongated radially.
any honeycomb tissue"
Inner cortical cells forming a
Lamina solid, devoid of
with stipitate lateral blades arising from
along the lower margins of the primary lamina.
Margins diffe:centiated.
Medulla uniformly compact, wi·t:hout vacuole-like spaces a.nd XJO
differentiated central zone of loosely interweaving, highly branched
)
hyphae. Walls of cortical cells and hyphae never greatly gelatinized.
Conce2tacle wall smooth.
OO9.onia mainly attached directly to the
conceptacle wall, rarely on branched paraphyses,
f'ringe and upper subli"Uoral.
Never parasitized by HerpodiscU$ durvilleae.
=:;;;::c~.;;;,.
sublittoral
Endemic to New Zealand. Southeast: region of the NOJ:th Island,
South Island and Stewart Island.
Lectotype: Herb. Lindauer No. 8823, AKU (right hand
specimen), Annotated "DiUrvilZea. /;)iUa.nu,
Stewart Is, Broad Bay 19: 8: 46".
Lindauer et al. (1962:286) stat:ea that the type was in
Lindauer's herbarium at. the University of Auckland. In AaaIOS et aZ.
(l974:208) Herb. Lindauer No. 6700, AKU yJCtS listed as type (on the
advice of Prof. V.J" Chapman)- 'rhat specimen lacks most o:f its