— 2 — 
Wir führen zum Schluss noch die Beschreibungen der 
neuen Genera und Species an. 
Entophysalis Magnoliae Farlow. Cells dark 
purple, 0,004—6mm in diameter, united in twos and fours 
and imbedded in jelly, which forms a densely branching 
mass. — This alga forms a thin slime on exposed rocks. — 
Monostroma pulchrum Farlow. Fronds membranaceous, 
fasciculate, light green, lanceolate or cuneate - lanceolate, 
attenualed at the base, margin crisped, two to twelve inches 
long, two inches broad, substance very delicate, about 
0,006mm in thickness, cells irregular, more or less sinuous, 
intercellular substance small. — Monostroma crepidinum 
Farlow. Fronds delicate, light green, one to three inches 
long, flabellately orbiculate, split to the base, segments 
obovate, 0,018— 36mm thick, edle roundish -angular, inter- 
cellular substance prominent, — Ectocarpus Chordariae 
Farlow. Filaments much branched, irregularly nodose, 
about 0,02mm in diameter, sunk in the tissue of the host- 
plant; hairs and fertile branches erect, the former projecting 
above the surface; uniloeular sporangia on short stalks, 
solitary or clustered, oval, about 0,07mm broad by 0,14mm 
long; plurilocular sporangia unknown. — Parasitic inthe fronds 
ofChordaria divaricata, Leathesia tuberiformis and other Phaeo- 
sporeae. Nemastoma Farlow nov. gen. Fronds gelatino-car- 
nose, compressed-cylindricae or plane, dichotomous or subpin- 
nate, composed of an axial layer of densely woven longitudinal 
filaments, from which are given off short, lateral, dichotomous, 
fastigiate filaments, which are united by a gelatinous sub- 
stance to form a peripheral lager; tetraspores cruciate, borne 
in the peripheral layer, antheridia borne on the superficial 
cells of the periphery; eystocarps (favellae) buried in the 
peripheral layer, spores escaping by a narrow opering bet- 
ween the peripheral filaments. N.(?) Bairdii Farlow. 
Fronds purplish -rose colored, gelatinous, four inches long, 
one inch wide below, vermiform, once or twice-diebotomously 
divided, axils acute, apices attenuated; tetraspores cruciate, 
home on the tips of the peripheral filaments. 
Thirty-first annual Report on the New-York State 
Museum of Natural History. 1879. 
(Schluss.) 
Diach®a subsessilis Pk. Gregarious or erowded; 
sporangia subglobose, sessile or with a very short white 
stem, the walls delicate, iridescent with various metallie 
