Pleurococcus pulvereus H.C.Wood

PL2URGC0CCUS PDL73BETJS, T70GD (sp. ncv.] - . Fresh-water Algae of the

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

knowledge, 241).

P. cellUlis minimis, eaeruleo-viridibus, encrmiter snbglobosisr,
vel angulosis, in familias numerosas consociatisi famili is e
cellulis numerossissimis et dense confertis compositis, irre-
gular i bus, interdum eonfluentibus, plerumcue pseudotegument is
hyalinis involutis, in strato pulvereo Irete viridi aggregates .

Diam. -1 /2400"-3/2400" = . 00004"-. 00013".

Hab.-In fonte. "Boiling Springs," prope Beliefonte, Pennsylvania.

Cells very small, bluish-green, irregularly subglobose, oval, or

angular, associated in numerous families; families composed of
very numerous and densely crowded cells, irregular, sometimes
confluent, mostly surrounded by a false hyaline tegument, ag-
gregated into a bright green pulverulent stratum.

EELIàEES.- in Centre County, Pennsylvania, two miles from Beliefonte,

.there is a very large and beautiful limestone spring, which
is a favorite roadside watering place, and is laid down on the
maps as "Boiling Springs." Forming a stratum over most of the
bottom of this spring is the little plant here described. The
stratum is in places nearly an inch in thickness, and when
lifted by the hand is found to be dry and crumbly, instead of
mucous and tenaciotis. Under the microscope it is seen to be
composed of vast numbers of irregular masses or families of
cells imbedded in a firm jelly, which projects so as to form a
sort of transparent coat to the whole mass; this cast I have
spoken of in the description as a false tegument. The cells

i-U ___?«*	___ _ _ _ j	.	NEW YORK BOTANICAL GARDEN

themselves are exceedingly small and furnished with an excentric	new york

point, which is probably a nucleus.	botanical

02110060	CARDEN

02110060