On the identity of Chorda rimosa Montagne (Phaeophyceae)

Aldo Asensi, René Delépine, Florence Rousseau, and Bruno de Reviers
ALL FIGURES

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Figs 1-3. Original collection of Chorda rimosa Montagne. Fig. 1. Envelope and four enclosed small fragments of isolectotype collection (PC, #MA 7475), labelled in Montagne's handwriting : "Chorda rimosa Montag. Voy. Pole Sud"). Fig. 2. Envelope containing the lectotype collection (PC, #MA 7476), labelled in Montagneís handwriting: "Chorda rimosa Montag. Auckland". Fig. 3. Details of enclosed specimens of the lectotype collection, inside the envelope; arrows show places of sampling for histological studies. (Scale bar = 5 cm for Figs 1-3.)


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Figs 4-5. Original drawings of Chorda rimosa Montagne (PC #MS435, p. 5055 ; on recto verso sheet of paper, with comments in Montagne's handwriting).
Fig. 4. Recto. Paraphysis and sporangia. Montagne's comments = down: "Iles Auckland. Chorda rimosa Montg. M d'Urville"; lower left: "toutes les fig. 380" [all figures 380; 380 likely means the enlargement]; uppper left: "junior" [?]; upper right: "brun" [brown] and "vert" [green]. Empty arrowhead: unicellular paraphyses; arrowhead: apparently multicellular filaments (see text) and unicellular paraphyses.
Fig. 5. Verso. Longitudinal section. From right to left: paraphyses and unilocular organs, epidermis, cortex and network of medullary filaments. Montagne's comment = below the drawing: "Composition et / épaisseur de la fronde / 380" [Structure and / thickness of the erect thallus / 380; 380 likely means the enlargement]. (Scale bars = 5 cm for Figs 4-5.)


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Fig. 6. Transverse section of Chorda rimosa Montagne in the adult specimen indicated by an arrow in Fig 3.

From top to bottom: i) paraphyses and sporangia containing zoids, ii) very thin epidermal layer, iii) three or four layers of larger cells rendered empty by sectioning, and iv) some indications of medullary network (arrows). (Scale bar = 100 µm.)


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Figs 7-8. Longitudinal section of Chorda rimosa Montagne in the adult specimen indicated by an arrow in Fig 3. Fig. 7. General view. Fig. 8. Detail of basal part of Fig. 7 showing the longitudinally elongated filaments of the medullary network. (Scale bar = 100 µm for Figs 7-8.)


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Fig. 9. Electron micrograph of the adult specimen of Chorda rimosa Montagne indicated by an arrow in Fig 3. Arrow: plastid with obvious thylacoids. Asterisk: structure without visible thylacoids which is interpreted as a pyrenoid. (Scale bar = 200 nm.)


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Fig. 10. Adenocystis sp. from New Zealand. Photography of a herbarium sheet (Welt #A16381) showing specimens collected on intertidal rocks 9 march 1985 by C. D. Meurck in Penguin Island (Bounty Islands), New Zealand. a: place of Müllerís sampling, aa: place of Asensiís sampling (mature part), aa1: place of Asensiís sampling (very young plantlets 1 mm long developed on basal part of tufts). (Scale bar = 5 cm.)


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Fig. 11. Adenocystis sp. from Bounty Islands (New Zealand), longitudinal section of a young specimen (Sampling aa1, see Fig. 10). Note obvious very dense filamentous medulla, not hollow yet. (Scale bar 100 µm.)


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Fig. 12. Adenocystis sp. from Bounty Islands (New Zealand), longitudinal section in an other zone of a young specimen (Sampling aa1, see Fig. 10). Note empty zones between medullary filaments; these zones correspond to the appearance of the central cavity which is bordered by the network of anastomosed hyphae in more mature regions. (Scale bar 100 µm.)


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Fig. 13. Transverse section in a mature part of Adenocystis sp. from Bounty Islands (New Zealand). (Sampling a, see Fig. 10). Compare with the very similar structure in Fig. 6 (observed in sampling aa too, but not shown). (Scale bar 100 µm.)


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Figs 14-15. Longitudinal section in a mature part of Adenocystis sp. from Bounty Islands (New Zealand). (Sampling a, see Fig. 10). Fig. 14. Focus on paraphyses and unilocular organs. Fig. 15. Focus on the medullary network identical to that observed in Chorda rimosa: Compared with Figs 7, 11 and 12. (Observed in sampling aa too, but not shown.) (Scale bar 100 µm.)