20 
NEW OR CRITICAL BRITISH ALGLE. 
Ectocarpus tomentosoides, Farlow. Bullet. Torrey Bot. Club. Vol. 
xvi., No. 1. 
Weymouth. 
A species related to E. tomentosus, but the filaments, which are 
seldom more than from | to \ in. long, are from a quarter to a 
third narrower, the sporangia never recurved, and usually consisting 
of only a single row of zoospores. Furthermore the plant does not 
form into rope-like masses, but grows in patches, often several 
inches in diameter. The filaments are densely interwoven, 
sparingly and irregularly branched, 6-8 fJb in diameter, cells short, 
rarely twice as long as broad, the sporangia very numerous, diverg- 
ing at right angles from the filaments, sessile, linear, 60-80 p long 
by 6-7 fi broad. 
Leptonema fasciculatum, Eke. Algenfi. p. 50, Atlas, t. 9, 10. 
On Zostera. Cumbrse. 
The filaments of this minute plant are at first simple, and arise 
in tufts from a horizontal branched protonema, later on they 
become densely branched at the base while remaining simple 
above, when mature presenting a close resemblance to a small 
Elachista. The plurilocular sporangia are produced in the con- 
tinuity of Ihe upper portion of the filaments in the same manner as 
in the genus Pylaiella; the unilocular sporangia are oval, sessile, 
or shortly stalked, and are borne laterally at the base of the fila- 
ments. Filaments 10-12 p thick. 
Ascocyclus fcecundus, Eke. Algenfi. p. 46. 
On Zostera , Laminarice , etc. Cumbrse. Not uncommon. 
This species is characterized by the erect filaments which arise 
from a monostromatic basal-disc, being entirely transformed 
into conical, plurilocular sporangia, which are placed side by side 
without any intervening sterile filaments, the place of which is 
taken by a few colourless, soft hairs. 
Ascocyclus fcecundus, Eke. var. se*iatus, Eke. Algenfi. p. 47, 
Atlas 1. 16. 
On Laminarice , etc. Cumbras. 
This plant may be at once distinguished from the preceding by 
the sessile sporangia being cylindrical and containing only a single 
row of zoospores. In general appearance the plant greatly 
resembles A. orbicularis , but the very characteristic colourless, 
rigid, unicellular ascoid bodies, so marked a feature of that species, 
are absent. The absence of these ascoid bodies (from which the 
genus takes its name) led Stroemfelt to place the plant in a new 
genus, Phycocelis. 
Ascocyclus balticus, Reinke Algenfi. p. 45. Atlas 1. 16. 
On Laminarice. Cumbrse. 
This species comes very near to the last, but may be distinguished 
from it by the sporangia being formed by the transformation of the 
upper cells of the assimilation threads, not by the transformation 
of the entire thread. 
