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Volume 76, 1946-47
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Note On a New Species of Red Alga, Lenormandia Coronata

[Read before Hawke's Bay Branch, November 1, 1945; received by the Editor, February 1, 1946; issued separately, June, 1946.]

In publishing this paper after the lamented death of the late Professor Setchell the junior author presents the following explanation. In 1936 a paper under joint authorship was suggested by Professor Setchell, the illustrations to be prepared by Dr. N. L. Gardner, who, however, passed away before completing the series of drawings, when it was decided that they be done by the junior author as well as the English text, Professor Setchell contributing the Latin description and the necessary research work. In 1940 specimens, together with a Latin description, were privately distributed under the name Lenormandia coronata Lind. et Setch., the junior author's name appearing first at the wish of Professor Setchell, who wrote (private correspondence): “You will see that I am proposing this as a joint species and am placing your name first, as seems to me just. I trust that you will conform to my wishes in this matter.” During the illness and since the death of Professor Setchell the junior author decided to withhold the Ms. but has since been persuaded to publish it.

Lenormandia coronata sp. nov. Plate 1.

Frons stipite cylindrico, distincto, per discum solidum affixo, ramoso; ramis biformibus: (1) stoloniferis, e stipite lateraliter emergentibus, recurvantibus et frequenter ad substratum affixis et laminas complanatas emittentibus, (2) ramis sparsis, erectis, alternis, superne et gradatim in laminis tenuibus complanatis, plus minusve spatulatis, ad apices obtusas anguste et obtuse mucronatis, nervi longitudinali obscura, superficie non arcolata, expansis; laminis obovatis, 1–3 cm. altis, 0.3–0.7 cm. latis, mucronatis, nunc semel aut bis constrictis, cellula apicali horizontaliter divisa et axi monosiphonea provisis, 180–210 μ crassis, 5–6 cellulo-stratosis: 1–2 stratis medullaribus cellulis subsphericis usque ad ellipsoideis usque ad 125 μ diam., subcorticalibus unistratosis parvioribus, corticalibus isodiametricis, 20–30 μ diam., superficie irregulariter hexagoniis, compositis; chromatophoris taeniiformis; stichidiis 1–16 in verticillis, sub apice oriendis, complanatis, ovato-oblongis, mucronatis, breve et late pedicellatis, circa 1 mm. altis; tetrasporangiis indistincte in 4 seriebus longitudinalibus ordinatis, tripartitis; cystocarpiis vulgo marginalibus, subglobosis, breviter stipitatis, carpostomio apicali.

Fronds gregarious, bright red, ramose, composed of an erect portion and of terete, recurved, stoloniferous branches emerging laterally from the stipe, frequently affixed to the substratum by small, solid discs; from the stolons, which may be ramified, arise, at

Picture icon

Lenormandia coronata Lindauer et Setchell sp. nov.

A.

Very large tetrasporic plants. X1.

B.

Normal tetrasporic plants. X1.

C.

Cystocarpic plants. X1.

D.

Tip of tetrasporic frond. X6.

E.

Tip of cystocarpic frond. X6.

F.

Terminal portion of stichidium. X36.

G.

Tetrasporangium.

H.

Cystocarp. X36.

I.

Carpospore.

J.

Transverse section of frond.

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irregular intervals, further series of erect laminae which are simple or sparsely branched on the stipe, the branches either developing into stolons or gradually flattening into complanate, submembranous, more or less spatulate, obovate, long- or short-stiped blades 1–3 cm. high and 3–7 mm. wide, sometimes once or twice constricted, apices obtuse-angustate or obtuse-mucronate, sometimes attenuated and produced into a terete branch which behaves as a stolon; longitudinal nerve obscure, surface non-areolated; structure of 5–6 layers of cells: a medulla of 1–2 rows of large, spherical, or ellipsoidal cells, an intermediate of smaller cells, and an assimilative layer of a single row of small, isodiametric cells, irregularly hexagonal in surface view, chromatophores taeniform; stichidia 1 mm. high arranged verticillately and subapically in groups of from 1–16, obovate-oblong, mucronate; tetrasporangia 3-partite, in about 4 longitudinal series, subapical, at the distended portion; cystocarps few, marginal, in the neighbourhood of the apex, subglobular, shortly stipitate, with an apical carpostome, carpospores long-pyriform.

Type specimen: No. 555243, Herb. Univ. Calif.; Co-types distributed (May, 1940) in Lindauer, Algae Nova-Zelandicae Exsiccatae, Fasc. III, No. 74.

This plant, although undoubtedly a Lenormandia, is not thoroughly characteristic of the genus in the following particulars; the inconspicuous midrib, the non-tessellated surface, the unusual development of stipe and branches, and the stichidia surrounding the apical “mucro.”

Habitat: Bay of Islands. In deep tide-pools somewhat elevated above low water mark, attached along the water-line; under overhanging ledges in pools connected with the sea; and on the edges of narrow channels connecting pools with the sea at extreme low water. From May to October. Cystocarpic plants somewhat rare.

It is possible that, in the past, the plant has been overlooked owing to its vague resemblance to Rhodymenia leptophylla, for which it may have been mistaken.