Grallatoria reptans M.Howe

• Region

  West Indies

• Country

  Bahamas

• Locality

  Great Ragged Island, on rock, near low tide mark

• Coordinates

  22.2027, -75.7271

• Coordinate Uncertainty (m)

  3801.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Great Ragged Island. Measured from coordinates to farthest extent of the cay to find linear extent (3790 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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2. GRALLATORIA M. A. Howe, gen. now

?Thallus filiform, monosiphonous, the primary filaments dorso-ventrally or-
ganized, repent, uncorticated, the ramuli (“short branches”) lateral and dorsal
in origin, in threes or falsely fives and semi-verticillate, or in opposite pairs;
opposite lateral ramuli commonly each forking in its basal cell, the two mem-
bers simple or subsimple, few-celled, one of each pair ascending, the other de-
flexed and terminating in stelliform or avipedate haptera, giving the primary
filaments the appearance of walking on stilts; dorsal ramuli comparatively
stout, erect, repeatedly ramified, the branching somewhat secundly subdichot-
omous or occasionally subtrichotomous. Chromatopbore in the younger cells an
irregular subspiral band, in the older apparently consisting of numerous minute,
more or less confluent granules. Sporangia on ramelli of the dorsal ramuli,
usually tetrahedrally divided (tripartite). Other parts unknown.

1. Grallatoria reptans M. A. Howe, sp. nov.

Repent primary filaments simple or sparingly dichotomous, sinuous, 38—66 fi
in diameter, their cells 1.5-2 times as long as broad, often bulging slightly above
the septum, their walls 5-13 n thick, opposite lateral ramuli from nearly every
segment of the primary filament, the ascending prong simple, 200-400 /* (4-8
cells) long, tapering, about 20 /j- in diameter near base, about 8 p- at apex, the
deflexed stilt-like prong simple or once furcate, mostly 150-450 fi (4-6 cells)
long, slightly tapering, 20-26 /j. in diameter; dorsal erect ramuli 1-4 mm. high,
springing usually from every second segment of the primary filament, their main
axes 34—46/* in diameter near base, the basal cell 1.5—2 times as long as broad,
the succeeding cells mostly 3—6 times as long as broad, the penicillate, or dimidio-
subfastigiate terminal divisions subsecund along the inner (anterior) faces of
the divisions; tetrasporangia obovoid or pyriform, solitary, or in twos or rarely
threes, 52-64 X 40-50 p. (including wall, which is 6—8 /t thick), tripartite or
sometimes irregularly divided, mostly on one-celled pedicels; ovoid, globose or
pyriform densely granular cysts 60—150 in diameter occasional, especially
near the distal ends of the deflexed gralliform filaments; color of plants
vinaceous-purple to dark vinaceous-brown (near the color of Wrangelia Argus).

Forming a soft purple or reddish-brown lubricous velutinous coating in crevices
of surf-beaten rocks near the low-water mark, covering small shells, crustaceous or
prostrate algae, etc. In size and habit, the plant bears some superficial resemblance
to species of Acfoohaetium or to Rhodoclvovtou RotJiii, but its affinities are apparently
with Wranfjelia, from which, however, it amply differs in the cMracters indicated.

Great Ragged Island (Ilowe 578.)—type—and

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