Avrainvillea nigricans f. fulva M.Howe

• Region

  West Indies

• Country

  Bahamas

• Locality

  Castle Island. inside a reef, common in 3-10 dm. of water

• Coordinates

  22.13, -74.3145

• Coordinate Uncertainty (m)

  1731.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Castle Island. Measured from coordinates to farthest extent of the cay to find linear extent (1720 m). Input information into MaNIS Georef. Calc. to find uncertainty radius (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

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COLUMBIA

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Phycotheca BorealNAmericana.

Collins, Holden, and Setchell.

1480. Avrainvillea nigricans fulva

M. A. Howe, forma nova.

Differs from the typical form of A. nigricans in its thicker,
more spongiose, and usually more cuneate flabellum, in its flatter,
broader, less differentiated stipe, and in the firmer-walled, usually
coarser though often more tapering filaments, which are less reg-
ularly moniliform, often more tortuous or zig-zag, more frequently
and more divaricately dichotomous, and nearly always yellow or
yellowish-brown rather than fuscous at maturity.

Common in 3-10 dm. of water, inside a reef, Castle Island,
Bahamas, Dec. 22, 1907.

New York Botanical Garden Expedition to the Bahamas,
collected by Marshall A. Howe.

The present form is rather common in the West Indies and
by a certain combination of characters is thus far readily dis-
tinguishable from the typical A. nigricans, in association with
which it sometimes grows, yet it seems difficult to point out any
one character by which it may be always recognized, or even any
combination of characters which can be described in sufficiently
precise terms for specific distinction. The Jamaican plant of
which the supposed sporangia were recently described and fig-
ured (Bull. Torrey Bot. Club, Vol. XXIY, pp. 504-507, PI.
XXVIII, figs. 8-25, 1907) belongs to forma fulva, and the form
has been included in our previous descriptions of the extremely
variable A. nigricans (Bull. Torrey Bot. Club, Vol. XXXII, p.
568, 1905; Vol. XXXIV, p. 508, 1907.)

M. A. H.

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