The English flora - SeaweedAfrica

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Gomphonema.] ALGJE DIATOMACEiE. 409
branched, branches alternate, the frustula linear wedge-shaped
flabelliform. Ag. Conspect. Crit. Diat. p. 42. Meridion radians,
Ag. Syst. Alg. p. 3. Exilaria fiabellata, Grev. Crypt. FL
t. 289.
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Parasitic on marine Alga? and Zostera marina ,• Bantry Bay, Ireland,
Miss Hutching. Appin, Capt. Carmichael and Rev. M. J. Berkeley.—
singularly elegant species, forming dense green tufts, half an inch in
height; thefrustula united into beautiful fan-shaped expansions at the
ends of the branches, and bearing a single or double row of globules, or
oblong spots of a darker colour than the yellow frustula themselves.
The finest specimens I have seen are those on Zostera mariiia. The
Irish ones are smaller, and grew on Chorda Filum, var. T/oix.
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106. Meridion. Ag. Meridion.
Frustula wedge-shaped, in plane sessile circles or segments of
circles.—Name ; from pipe, iboi, a portion or particle, in allusion
to the minute fragments which compose it.
1. M. circuldre, Ag. (circular Meridion); mucose stratum
scarcely any, frustula united into numerous nearly complete
circles. Ag. Conspect. Crit. Diat. p. 40. Echinella circularis,
Grev. Crypt. FL t. 35. Exilaria circularis, Grev. I. c. (synops.)
p. 37.
Marshes, stagnant waters and rivulets ; forming a green stratum
on mud, stones, dead leaves, &c. Spring. Near Edinburgh, Mr.
Arnott and Dr. Greville.— Under the microscope, the frustula are
found to be very minute, perfectly plane, and united into more or less
complete circles of various sizes, partly hyaline, partly of a yellowishgreen
colour. When dry, the mass is dark-green and somewhat glist-
ening.
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Tribe XXV. Cymbelleje.
Frustula elliptical.
107. Gomphonema. Ag. Gomphonema.
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