352 
libus in polysiphoniis basalibus segmentis later- 
alium, late ovoidis, ore conspicuo ornatis; tetra- 
sporangiis positis in 2-3 regularibus seriebus in 
magnis fusiformis stichidiis in monosiphoniis 
pedicellis. 
Fronds small, pink, tufted, tender and flaccid, 
filiform, 2-4 cm. high, decompound, alternately 
subdistichously branched, main branches corti- 
cate, pericentral cells 5, ultimate branchlets 
monosiphonous, dichotomous, divaricate, tips 
obtuse, articulations 3-4 times as long as wide, 
terminal ramuli often crowded together and 
incurled; cystocarps large, sessile on the poly- 
siphonous basal segments of laterals, broadly 
ovoid with a prominent orifice; tetrasporangia 
in 2-3 regular rows in large, fusiform stichidia 
on monosiphonous pedicels. Summer; annual. 
The plant is closely allied to D. collabens 
H. et H. but is very diminutive in size and is 
epiphytic upon a different type of host, as well 
as being restricted in range to the north of New 
Zealand. It is also able to withstand exposure 
to the atmosphere during low tides. 
Distribution: On Corallina in the littoral re- 
gion at low-water neap tide during the summer 
months; common at Long Beach, Russell (type 
locality ) ; Auckland. 
Type specimen No. 947, Herbarium Lin- 
dauer; iso-types distributed in Lindauer ( 1947), 
Algae Nova-Zelandicae Fxsiccatae, Fasc. XII, 
No. 300, as Heterosiphonia subtilis. 
ACKNOWLEDGMENTS 
The writer is indebted to Professor V. J. 
Chapman of Auckland University College for 
many invaluable suggestions and continual help 
during the necessary research; to Professor G. F. 
Papenfuss of the University of California for 
much assistance in determining specimens and 
for consenting to read and criticize the original 
manuscript; to Mr. L. W. Crawley of Auck- 
land University College for translating the de- 
scriptions into Latin; and to the Research Fund 
PACIFIC SCIENCE, Vol. III, October, 1949 
Committee of the University of New Zealand 
for the liberal grant made in connection with 
the writer’s researches. 
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Agardh, J. G. 1877. De algis novae zelandiae 
marinis. Lunds Univ. Arsskr., Afd. 2, 14 (4). 
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— — 1882. Till algernes systematik. Lunds 
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de-Toni, J. B. 1895- Sylloge Algarum. Vol. 3. 
xvi + 638 pp. Patavii. 
Feldmann, J. 1937. Les algues marines de la 
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phycees, Pheophycees. Rev. Algologique 9 
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Hamel, G. 1931-1939. Pheophycees de France. 
l-80+i-xlvii+8 1-432 pp, 63 figs, 10 pis. 
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Harvey, W. H. 1855. Algae. In: J. D. Hooker, 
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Hauck, F. 1885. Rabenhorst’s Kryptogramen- 
Flora. 575 pp, 236 figs, 5 pis. Eduard Kum- 
mer, Leipzig. 
Hooker, J. D. 1867. Handbook of the New 
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Kjellman, F. R. 1891-1893. Phaeophyceae. 
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Laing, R. M. 1926. A reference list of New 
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— 1929. A reference list of New Zealand 
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