ICoelastrum
cambricum. Archer Micro. Journ., 1868, p . 65.
Cells rounded on the exterior margin, each bearing a single
truncate tubercular process.
In pools.
“ I t was obtained by Mr. Archer on his visit to Wales, and is not referable
to either of the remaining forms (besides C. sphcsricuni) as
described by Na.geli, though perhaps showing most affinity with Creías,
trum cuhicuM, but differing in each cell possessing bnt one process, or
tubercle-like appendage, not three. These likewise showed various conditions
of the growth of the youno: coenobia within the mother-cells from
the earliest stage, the most minute of which showed the full character
of the cells, each with the truncate tubercle-like process.”—Quart.
Journ. Micro. Soc., I.e.
Coelastrum microsporum. (Nag-) Braun Alg. TJnic. p. 70.
Cells 8-1 6 or .82, exactly sphærical, containing a single globule ;
interstices small.
S i z e . Ooenobium -04 mm. diam. ; cells '009 mm. diam.
Micr. Journ,, 1868, p. 65. Pritcliard’s Infus. f. 755.
In bogs and pools.
“ The group (cænobium) is formed of rather large cells, externally
globularly rounded, their margins, w'here in mutual contact, being
straight, and leaving at the angles exceedingly minute, somewhat triangular
interspaces, like very minute pores, leading into the central
cavity characteristic of the forms appertaining to this genus.”—Archer-.
G en u s 31. STAUROGENIA. Kutz.
Coenobram cubical, hollow within, formed of 4-8-16 quadrate
or sub-quadrate cells. Propagation by quiescent gonidia,
produced after the subdivision of the cell-contents. — E a b .A lg .
E u r. iii. 80.
Crucigmia, Morren in Ann. des Sci. Nat., 1830, t. 20, p.
404.
S tau zo g enia le c ta n g u la iis . Braun Alg. Unie. p. 70.
Cells ohlong-oval, 4-16-64, associated in tabular families,
almost twice as long as broad, angles obtusely rounded.
S i z e . Cells -0075 x '004 mm.
Archer in Quart. Journ. Micr. ScL, 1875, p. 206.
In pools.
Plate X F in . fig. 3. a, families X 400 ; 5, magnified 800.
G en u s 32. SORASTRUM. Kutz. (1845.)
Cænobium globose, solid within, free swimming, formed of
4-8-16-32 compressed wedge-shaped cells, which are sinuate,
emarginate, or bifid at the apex, and radiately disposed. Pro pagation
unknown.—Babh. Alg. Eur. iii. 81.
The family (or cænobium) in this genus is solid, and not hollow as in
Coelastrum, composed of wedge-shaped or heart-shaped cells, somewhat
compressed and united into globose families, the narrow ends meeting
in the centre, with the outer margin emarginate or divided.
S o ra s tium s p in u lo s um . Nag. Einz. Alg. p. 99.
Cænobium spinulose, cells wedge-shaped, apex slightly
emarginate, angles obtusely rounded, bi-spinulose.
S iz e . Cænobium to '04 mm. diam.
Archer Micr. Journ., 1866, p. 124. Pritch. Infus. t. I, f.
56-58. Rabh. Alg. iii. 81. Reinsch Algenflor. p. 86, t. 5, f. 6.
In stagnant water.
Plate XIX. fig. 1. a, i, families magnified 400 diameters ; c, side
view of cell ; d, front view of same.
G en u s 33. S E L E N A S T R UM . Reinsch.
Cells semilunate, joined together by the middle of the convex
margin, in families of 4 -8, regularly disposed. Propagation
unknown.— Reinsch Algenflor. F ra n k , p . 64.
S e le n a s tium B ib r a ia n um . Reinsch Algenjlora p. 64.
Cells semilunate, with the cusps either expanded or curved
inwards ; minor families constituted of four cells in pairs, major
families of these combined in more or less sphærical masses.
S i z e . Cells •U16--023 mm. long X -005-'008 mm. diam. ;
minor families •028-'081 mm. diam.
In moor pools.
Plate XIX. Jig. 3. a, families magnified 400 diameters ; 6, pair of
cells magnified 1000 diameters.
Sub-Family 9 . O h a e a c ib æ .
Cells always innate, often distinctly stipitate, variable in
form ; cell-membrane delicate, growing thicker with age (then
double membrane visible) ; cell-contents bright green, homogenous,
afterwards always granular, with one starch gra,nule,
ultimately divided. Propagation by repeated binary division of
th e cytioplasm, resulting in more or less numerous biciliate zoogonidia.—
Rabh. A lg . E u r . iii. 81.
G en u s 34. CH A RA C IUM . Braim. (1847.)
Cells oblong, ovate, pyriform, fusiform, rarely acioular or
subglobose, equal or oblique, erect or inclined, attenuated at
th e lia s e in a hyaline stem. Cell-contents green, homogenous
or granular, zoogonidia, succeeding division of the cytioplasm,
more or less numerous, occupying the whole of the cell, a t
length greatly agitated, escaping by a lateral (rarely terminal)
r u p t u r e , oblong, with two vibratile cilia.— Unicel. Alg.
p . 29.