Dasya atropurpurea Vroom 2005

Publication Details
Dasya atropurpurea Vroom 2005: 575-578, figs 2-24

Published in: Vroom, P.S. (2005). Dasya atropurpurea sp. nov. (Ceramiales, Rhodophyta), a deep-water species from the Hawaiian Archipelago. Phycologia 44: 572-580.

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Type Species
The type species (holotype) of the genus Dasya is Dasya pedicellata (C.Agardh) C.Agardh.

Status of Name
This name is of an entity that is currently accepted taxonomically.

Type Information
Type locality: Pearl and Hermes Atoll, close to Southeast Island, NWHI (27º46·887'N, 175º48·774'W). ; (Vroom 2005: 577) Holotype (tetrasporophyte): Molly Timmers; 1 August 2003; Numerous drifting individuals observed over a gradually sloping substratum composed of hard carbonate pavement and rubble at a depth of 22-24 m; BISH; 708675 (PSV20124) (Vroom 2005: 577) Notes: Paratypes: From the personal herbaria of Isabella Abbott and Peter Vroom: IA17062, IA17346, IA23208, IA23269, IA26076, IA29020, IA29031, IA29102, IA29113, IA29353, PSV20123, slated for eventual deposition at Bishop Museum.

Origin of Species Name
Adjective (Latin), black-purple (Stearn 1973).

General Environment
This is a marine species.

Description
Plants brick red to ruddy brown with a bluish tinge when living; upright, 13-45 cm high with heavily corticated percurrent axis 1.5-3.5(-5.5) mm in diameter. Numerous secondary and tertiary corticated axes produced radially, 1-3 mm wide, bearing monosiphonous pseudolateral branches towards apices. Pericentral cells five; cortex of rhizoidal filaments, often spirally twisted, composed of narrowly elongate cells. Monosiphonous pseudolateral branches produced sympodially in a radial pattern on every segment; 2-4 mm long, with acute basal subdichotomies under 45º every (2-)3-4 cells; 4-8 subdichotomies on any filament, attenuate from their base to the apex; apices unbranched; deciduous on corticated, lower axes. Basal cell of pseudolateral branches pyramidal in shape, 20-40 microns long and 40-55(-95) microns wide, with suprabasal cell distincly shorter than the subsequent cells, ranging from 30 to 60 microns long and 9 to 25 microns wide, L/W 1.6-3.6. Fourth cells along pseudolateral branches from 60 to 140 microns long and 15 to 30 microns wide, L/W 3-8; cells of ultimate filaments 2-10 microns in diameter. Adventitious monosiphonous filaments produced occasionally from pericentral cells and cortical regions in older portions of the plant, often becoming polysiphonous. Gametophytes dioecious. Procarps borne spirally on polysiphonous axes. Carpogonial branches three cells, with short trichogynes from 3-11 microns. Cystocarps sessile on lateral axes, urceolate, 1100-1500 microns in diameter, with necks 300-400 microns long and 250 -300 microns wide. Ellipsoidal carpospores produced apically on gonimoblast filaments in small clusters of 2-4; 48-66(-82) microns long and 20-35 microns wide. Spermatangial branches with two-celled stalk, produced near base of pseudolateral branches, 165-230 microns long and 35-50 microns wide. Lanceolate tetrasporangial stichidia on a 1-2(3) celled monosiphonous stalk, up to 1100 microns long and 165 microns wide, with 12-19 fertile segments, terminated by a two or three-celled sterile filament. Tetrahedral tetrasporangia 30-50 microns in diameter; four or five per node, with older tetraspores towards the base of the stichidia released first. Each tetrasporangium with three cover cells.

Created: 02 March 2006 by G.M. Guiry.

Last updated: 18 April 2007

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Citing AlgaeBase
Cite this record as:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 18 April 2007. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 20 April 2024

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