Cosmarium botrytis Menegh.

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NEW YORK
BOTANICAL
GARDEN

BOTANICAL

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IT COSMARIUM BOTRYTISlSe.liJ

NEW YORK BOTANICAL GARDEN

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p|. If “ 6. COSMAR.UW BOTRYTIS.

COSMtRIUM B0TRITI5, (BORY) MEHGH. - Fresh-water Algae of the

United States page 18, February 1872. (Smithsonian contribution to

knowledge» 2d).

C* l&te ovale, profunde constrictum, diametro plerumque 1^»S plo
longius; sinu angusto, lineare; semioellulis nonnihil triangu-
lar ibus, apice inter dura trunc&tis, interdum late rotundatis;
oytiodermate minute granulato.

Diam.-l/536* - 0.0019" (0.0014" - 0.0023"). (R.)

Syn.-C. Botrytis, (BORY) MEHEGHEITC. RABEHHORST, Flora Europ. Algarum,
Seot III. p. 158»

Hab.-Pennsylvania, WOOD,

C. broadly oval, profoundly constricted I-!*-# times longer than
broad; sinus narrow, linear; semioells somewhat triangular,
with the apex sometimes truncate, sometimes broadly rounded;
oytioderm minutely granulate*

REMARKS.-In this species the semioells, as viewed transversely, are
broadly elliptic in outline. The end view presents a longer
narrower ellipse, Their outline, when seen from the front,
varies remarkably from that of a very broad semi-oval to dis-
tinctly triangular with a truncate apex. The granules are
small and arranged regularly, sometimes they are very obscure.

I have often seen the endochrome so arranged as to leave a
large pyriform central vacuole in each cell, commandeating with
the narrow margin between it and the oell-wall. This vacuole
was apparently filled with a transparent fluid, in which were
minute granules in immense numbers, in constant active motion
circling among one another and passing out, into and along the
marginal connecting space. According to Ralfs, the sporangia
of this species are large (1/435”), with branched spines.

Pig. 5, pi. 21 represents an empty frond of this species; &
a, outlines of semicells to show the variations, and fig. 14,
pi. 12, represents a frond crowded with endochrome, magnified
460 diameters.

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