Micrasterias denticulata Bréb.

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PLATE XIII.

FlS 6 'BID VARIETY DENTICULATA.

MIOR AS T3BIAS DEHTICUIATA, BBEB.? - Fresh-water Algae of the ITnited

States page 18, February 1872* (Smithsonian contribution to knowl-
edge, 241) •

M. permagna, paulo longior quam lata, laevis; semicellulis quin-
quelobis (paene 9 lobis); lobis intermediis et baaalibus sim-
illimis, bilobatis, lobulis item in lobulis bifidia duobus
divisia;; lobo polare angusto, cuneato, in apioe plus minus in-
cisco; margins minute denticulato.

Diam.-Lat. .0092”* Long* .011,"

Syn.-M. denticulate, BBEBISSOH. BALFS, British Desmidieae, p. 70
et ABCHEB; PEITCHAZD’S Infusoria.

M. dentioulata, Brebisson.? BA3E1TH0BST, Flora Europ. Algarum,
Sect. 111. p. 192»

Hab. - Pennsylvania; WOOD. Florida; Bailey.

Very large, a little longer than broad, smooth; semicells. with five
lobes (scarcely 9}; basal and intermediate lobes alike bilobate,
lobules also divided into two bifid lobules; end lobe narrow,
wedge-shaped, more or less incised at its apex; margin minutely
denticulate.

BEMABKS.-Prof. Babenhorst gives M. dentioulata, BBEB, as merely a

variety of M. furcata, AG., stating that it only differs from
the latter in the marginal incisions and teeth. Hot having ac-
cess t© the original description of Brebisson I cannot express
an opinion as to whether Prof. B. is correct or not but the
specimen from which the above description was drawn upfand
which is figured on plate I3)oertainly differs from M. furoata
very essentially in the arrangement cf its lobes, and is, I

feel confident, M. denticulata, BBEB. of BALFS AUD ABCEEB.	NEWyorkbotamcalgarden

Fig. 6, pi. 13, is a drawing of this plant, as seen by my-
self, magnified 260 diameters.

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NEW YORK
BOTANICAL
GARDEN

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