Acrochaetium dwarkense Børgesen

Acrochaetium dwarkense Boergs., sp. nov.; A. macropodi Kylin
verisimiliter proximum, quod tamen praeter alia ramis saepe
alternantibus, chromatophoro stellato, sporangiis sessilibus (rarissime
pedicellatis), pilis praesentibus a nostra specie distinguitur.
Thallus epiphyticus, ad 500 ¡x altus, e cellula basali globosa
9-10 [i. lata et fills erectis (1 -pluribus) compositus. Fila evecta
opposite ramosa, in superiore parte ramorum plus minus unilater-
aliter ramosa, e cellulis in inferiore parte 6-7 (x latis 10-13 tA longis,
in superiore 3-4 jx latis sistentia. Chromatophorum parietale,
lobatum, pyrenoide minore laterali munitum. Monosporangia
ovato-globosa, pedicellata aut sessilia, 5 ¡x lata, 6-7 ¡jl longa.
India : Dwarka, on old specimen of Dictyotaceae.
From the basal globular cell, the wall of which is about 1-1-5 I-1
thick, several (usually 2-4) erect filaments issue (Fig. 2b). Near the
base, the cells are about 6-7 jx broad and 10-13 fx long, tapering
upwards to about 3-4 ¡x. The filaments are very much branched
from the base and upwards. The ramification is in most cases
opposite and a pair of branchlets are given out from almost every cell
in the main filaments, but occasionally a single branch only is
developed, and in the upper part of the filaments the ramification has
NEW YORK
BOTANICAL
GARDEN
Fig 2. Acrochaetium Dwarkense Boergs. a, a young plant; b, plant
with monosporangia ; c, part of a plant, (a, b, x 300 ; c, X 165.)
a tendency to become unilateral (Fig. 2c). The uppermost slender
parts of the filaments are unbranched.
The chromatophore is a thick, parietal, irregularly lobed plate
with a slightly protruding pyrenoid.
The sporangia are oblong-globular, about 6-7 [x long and 5 \i
broad. They are either sessile or pedicellate, the latter being the
more frequent. The pedicels are nearly the same length as the
sporangia.
...	_ 3.ç_Boergs . ,sp. nov.
Bull. Misc. InfT Z KeflTf 193?“ 13 ) : 114. f. 2,
A* macroDodi Kylin verisimiliter proximum, quod
tamen praeter alia ramis saepe alternantibus, chromato-
phoro stellato, sporangiis sessilibus (rarissime pedi-
cellatis), pilis praesentibus a nostra specie disting-
uitur.
Thallus epiphyticus, ad 500 u altus, e cellula
basali globosa 9—-10 }i lata et fills erectis (l-pluri-
bus) compositus. Fila erecta opposite raraosa, in sup-
eriore parte ramorum plus minus unilateraliter ramosa,
e cellulis in inferiore parte 6—7 u latis 10—13 u
longis, in superiore 3_4 u latis sistentia. Chrbmato-
phorum parietale,lobatum. pyrenoide minore laterali mun-
ltum. Monosporanaia ovato-globosa, pedicellata aut ses-
silia, ^ulataTo^7 u longa.
India: Dwarka, on old specimen of Dictyotaceae.
From the basal globular cell, the wall of which is
about 1— 1.5 u thick, several (usually 2—^) erect filaments
issue (Fig. 2u). Near the base, the cells are about 6—7 u
broad and 10—13 u long, tapering upwards to about 3— 4 u.
The filaments are very much branched from the base and up-
wards. The ramification is in most cases opposite and a pair
of branchlets are given out from almost every cell in the main
filaments, but occasionally a single branch only is developed,
and in the upper part of the filaments the ramification has a
tendency to become unilateral (Fig. 2c). The uppermost slen-
der parts of the filaments are unbranched.
The chromatophore is a thick, parietal, irregularly
lobed plate with a slightly protruding pyrenoid.
The sporangia are oblong-globular, about 6—7 u long
and 5 u broad. They are either sessile or pedicellate, the
new york botanical garden	latter being th e more frequent. The pedicels are nearly the
same length as the sporangia.
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