PDF file (text) - Cryptogamic Botany Company

REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 67
Exs.—Alg. Am. Bor., Farlow, Anderson & Eaton, No. 95.
On stones at low tide.
Eastport, Maine; Cape Ann, Mass.
We have referred to the present species a rather large form found abundantly in September, 1877, at
Eastport, near Dog Island, where it grows with Chordaria flagelliformis, which it somewhat resembles
in habit. It is much coarser than D. fœniculaceus, and of a darker color, and the branches are long and
flagellate, and furnished with comparatively few secondary branches. The Cape Ann specimens are
smaller and approach nearer D. fœniculaceus. The Eastport form can hardly be regarded as an extreme
state of D. fœniculaceus, but whether it is really the D. hippuroides of Areschoug admits of some doubt,
as Areschoug describes his species as being only six or seven inches long. According to Areschoug, the
conjugation of zoospores has been observed in this species.
FAMILY ECTOCARPEÆ.
Fronds filamentous, monosiphonous or sometimes partly polysiphonous, cortex
rudimentary or wanting; sporangia either in the continuity of the filaments or
external, sessile or stalked; unilocular sporangia globose or cuboidal; plurilocular
sporangia muriform (formed of numerous small rectangular cells densely aggregated
in ovoidal or lanceolate masses); growth trichothallic.
Fronds polysiphonous above, monosiphonous below, densely beset above
with very short horizontal branches............................... Myriotrichia.
Fronds generally monosiphonous throughout, branches free, opposite or
alternate..............................................................................Ectocarpus.
MYRIOTRICHIA, Harv.
(From µυριος [myrios], a thousand, and θριξ [thrix], a hair.)
Fronds olive-brown, filamentous, at first consisting of a single row of cells, which by
transverse and longitudinal division afterwards form a solid axis; branches short,
closely approximated, radiating in all directions, formed by outgrowths from the
superficial cells of the axis; unilocular sporangia spherical, borne on the axis
between the branches; plurilocular sporangia unknown; main axis and branches
ending in hyaline hairs.
A genus comprising three species which are hardly distinct. They form small tufts or fringes on
different Phæosporeæ, especially on Scytosiphon, and are recognized by the numerous short branches
which in some cases almost cover the main axis and cause it to resemble a Stigonema. The development
of the frond is given in detail by Nægeli in Die neuern Algensysteme.
M. CLAVÆFORMIS, Harv., Phyc. Brit., Pl. 101. (M. Harveyana, Næg. partim.)
Fronds half an inch to an inch in length, club-shaped in outline, axis clothed
throughout with branches, upper branches longer than lower and bearing secondary
branches.