40 
CHAN TRAN SI A S ANCT iE - MARIiE . 
A New British Species. 
By 0. V. DARBISHIRE. 
Daring the examination of some marine algae collected near 
St. Mary’s Island about four miles to the north of Tynemouth on 
the coast of Northumberland, a small and not previously described 
species of Chantransia was found. It has been given the specific 
name of Chantransia sanctce-mariee, after the Island of the same 
name. It was growing endophytically but intercellularly on the 
lower portion of a reproductive frond of Himanthalia lorea. Only 
one specimen of the latter was found to be infested with the new 
species, and unfortunately it was not possible to examine any 
material quite fresh. Thus the form of the chromatophore could not 
be properly determined but it appears to be plate-like and flat, and 
not split up. Chantransia sanctce-marice most nearly resembles 
Ch. immersa recently described by Kolderup Rosenvinge,* * * § but the 
latter has at least occasionally short hairs on the projecting cells. 
Only one long hair was found in the new species. The new species 
is also not unlike Ch. polyides of the same author, t It differs from 
this species however by its shorter cells. In Ch. polyides they 
may be four times as long as broad. This species also occasionally 
has hairs, though not so often as Ch. immersa. 
It may be mentioned here that the generic name Chantransia is 
used here, and not Acrochaetium Naeg., by which Batters has 
replaced the older generic name of Chantransia (D.C.) J I quite 
agree with Rosenvinge that the latter should stand, and that 
Acrochaetium should not take its place. § 
Chantransia sanctce-marice lives entirely inside its host plant, 
Himanthalia lorea , except for the outer walls of the sporangia. 
The filaments extend in a radial direction to a depth of over *4 
mm. The cells remain coloured even at this distance from the 
surface of the brown alga. The filaments push their way through 
* Rosenvinge, L. Kolderup, The Marine Algo; of Denmark, Part 1, p. 130. — Memoires 
d. l’Acad. Roy. d. Sciences et d. Lettres d. Danemark. Copenhagen 7me Ser. 
Sect. d. Sci., t. 7, no. 1, 1909. 
t Loc. cit. p. 132. 
$ Batters^ E.A.L., A Catalogue of British Marine algo;, page 58, Journal of Botany, 
§ Loc. cit. p. 80. 
