I ì
S^t-A'^-P-ira spren,..sp.
Ectospei-tyia teirestris, V a u c h . C o n f . p . 27. t. 2. f. 3.
H a b . On the ground in moist shady places. Annual. Spring.
Fronds more straight and rigid than in the preceding species, fa-m-
ing a more lax and less interwoven stratum, the summits of the little
hranches often erect, and giving the whole a bristly appearance. The
filaments are about an incl. in length, and irregularly branched, obtuse
at the apex. Vesicles scattered, hemispherical, sessile, and situated laterally
on little short horn-like processes or receptacles, which project
at a right angle from the branches. Suistance and colour similar to
the preceding.
Professor Agardh has another species, V. frigida, similar in its
habit and mode of growth to the two last. It is the Vaucheria terrestris
of Lyngbye, and is distinguished by globose vesicles attached
to a curved peduncle or receptacle. This plant has not come under
my oivn observation ; it seems, however, too nearly related to the species
we have just described.
* * Visicles two or more together.
4 . V a u c h e r ia s e s s il is .
Ironds entangled in floating masses, vesicles oval sessile in pairs,
with an intermediate little horn-like process.
Vaucheria sessilis, D e C a n d . S m . E n g . B o t. t . 1765. L y n g b . H y d r o p h . D a n . p . 80 t ->2
Ag.Sp.Alg.v.l.p. 466. Syst. Alg. p. 174. Sprang. Sp. PI. v. 4. p. 364
Ectocarpus sessilis, V a u c h . C o n f . t . 2. f . 7.
H a b . In pools and ditches. Annual. In the autumn, according
to Agardh. In February, according to “ English Botany,” and Lvnir-
bye. ' ®
Fronds capillary, irregularly branched, several inches in length,
forming broad patches, or floating masses on the surface of the water.
Vesicles lateral, ovate or ovale, sessile, in pairs, with a little curved
horn-like process between the individuals which form each pair. Substance
membranaceous, slightly elastic. Colour a rather dull green.
Being destitute of authentic specimens, and having never found this
plant myself, I am under the necessity of trusting to the descriptions
and representations of others. Agardh quotes the figure in “ English
Botany” doubtfully, but it appears to agree sufficiently with the account
of the species given by other writers. The specimens were
communicated by Mr Borrer, from the county of Sussex.
5. V a u c h e r ia o r n it h o c e p h a l a .
Fronds capillary loosely branched entangled in dense floating masses,
vesicles unilateral binate or quaternate oblique upon short straight
peduncles with a short beak and pellucid border.
Vaucheria ornithocephala, A g . S p . A lg . v . 1. p . 467. S y s t. A lg . p . 174. G r e v . F I . E d in .
p . 306.
Conferva vesicata, D illw . B r i t . C o n f . t . 74.
H a b . In pools and ditches. Annual. Autumn. Near Bristol,
Mr Young. About Edinburgh.
Fronds forming dense, very intricate floating masses, branched at
remote intervals, very slender, the branches spreading horizontally.
Vesicles unilateral, mostly in pairs, sometimes quaternate, ovate, oblique,
furnished with a pellucid limbus, supported upon a short straight
peduncle, and generally tipt with a short point or beak. Substance
membranaceous, brittle. Colour dull or brownish-green.
Not an uncommon species in still waters. Filaments three to nine
inches long, very fragile. The little beak at the summit of the vesicle
gives it some resemblance to the head of a bird, whence the specific
name.
6. V a u c h e r ia g e m in a t a . Tab. XIX.
Fronds dichotomous very slender forming dense floating masses,
vesicles ovate opposite laterally pedunculate on a horn-shaped process
or receptacle.
Vauchei-ia geminata, D e C a n d . Sm . E n g . B o t. 1 .1766. L y n g b . H y d r o p h . D a n . p . 80. t . 2.3.
A g . S p . A lg . V. 1. p . 467* S y s t. A lg . p . 174. G r e v . F I . E d in . p. 306. S p r e n g . S p .
P I . V. 4. p . 365.
Ectosperma geminata, V a u c h . C o n f . p . 2!). t . 2. f. 5.
H a b . In pools and ditches. Annual. Summer. Sussex, Mr
Borrer. In the neighbourhood of Edinburgh.
Fronds forming dense floating entangled tufts, very slender, somewhat
tenacious, nearly straight, dicbotomously branched. Vesicles
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