Acrochaetium dasyae Collins

• Region

  North America

• Country

  United States of America

• State/Province

  Massachusetts

• County/Municipio

  Barnstable Co.

• City/Township

  Woods Hole

• Locality

  on Dasya elegans (Mart.) Ag.

• Coordinates

  41.5265, -70.6731

• Coordinate Uncertainty (m)

  2564

• Georeferencing Method

  GEOLocate Web Application. Georeferenced to city center.

• Distribution

  Map all specimens of this taxon

NEW YORK BOTANICAL GARDEN

The F. 6 CÓOjns Herbarium

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The New York l ~t. mcal Garde*1

Sy N. l. Britton, 1S22

Pbyeotlieca Boreali-Americana.	Collins, Holden and Setcbell

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1342. Acrochaetium Dasyae Collins.

Collins, Rhodora, Yol. VIII, p. 191, 1906.

On Dasya elegans (Mart.) Ag., Wood’s Hole, Massachusetts,
Sept. 2, 1905.

F. S. COLLINS.

'Tws	TH-e

14-0LO TYPE OF:

AcAlocH-AeTton T)A^A£ KS.fioU.irAS
^VtoDoRA	(WOO),

------ -»«25

Chantransia Daayae nov* comb» Go11ins,
Rhodora^jZ^ 186» Aug. 1911*

Acrochaetiuta Dasyae Gol litis, RHODORA, Yol* VIII* p* 1?1> -• B*—A • > Ho* 1542.

7

SOTYPE

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copyright reserved

The New York
Botanical Garden

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BOTANICAL
PARD&Ì*

Filis 6-8 u crassis, parce ramosis, ramis erectis, secund-
atis, interluni levitar attenuatis; longitudine cellularum 2-5
diam. aequante; pilis non observatis; monosporis 9 * l6 u, in
superiore latere ramorum sessilibus, solitariis aut secundatis
singulis in eodem articulo; ad "basin fili primarii cellula sing-
ula rotundata (spora originali) processum brevem, descendentem,
simplicem vel ramosum, paucarum cellularum constitution, ad plantam
hospitem affixum, emittente; an Callithamnion virgatulum Harvey,
Nereis Bor.-Am., part 2, p. 243 ? Filaments 6-b u diam., cells 2-

5	diam. long, rather sparingly 'branched, "branches erect, second,
sometimes slightly tapering, hairs not observed; spores 9X16 U,
sessile on the upper side of the "branches, solitary or sometimes
in secund series, one on each cell of the branch; at the "base of
each primary filament a rounded cell, the original spore, emitting
a short, descend.ing process, sometimes "branched, of a few small
rounded cells, attached to the host. On Dasya elegans (Mart.) Ag.,
Wood’s Hole, Mass. Sept. 2, 1905.

This is the only species of Acrochaetium in which the spore
is persistent; the color "being the same as that of the host, there
is nothing to show the presence of the Acrochaetium without micro-
scopic examination. No authentic specimen has been seen of Harvey*
plant on Dasya, "but there is every reason to suppose that if Harvey
had seen "this “species, he would have included it in his Callitham-
nion virgatulum ; it is,however, distinct from the C_. virgatulum
of Wyatt, Algae Danmonienses, No. 189, which must "be considered as
authentic.

Acrochaetium Dasyae Collins, n. sp.
Ehodora H:191 • 190b.

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