404 
sporangium, while others bear both terminal and lateral. The 
sporangia are about 18 p thick and 50 y long. 
This species belongs to the sublittoral zone and is a fairly 
common epiphyte on several larger algae. It has been found in 
the open sea as well as in sheltered localities 
and bears both plurilocular and unilocular 
sporangia. The plurilocular sporangia occurred 
in May, June, July, November and December, 
the unilocular in April, May and November. 
F. typica has been found in the following 
places: — Vid.: Ostvig (H.J.); Ost.: Glibre(Q; Str.: 
Thorshavn (H. J., !), Gliversnaes (!); San do: Trold- 
hoved (!); Sy d.: Trangisvaag (Ostenfeld), Frodebo (!), 
Vaags Ejde (!),. Vaagsfjord (H. J.). F .pygmcea: — 
Kuno (H. J.); Syd.: Vaags Ejde (!). 
85. E. siliculosus (Dillw.) Lyngb., Hydro- 
phyt., p. 131, tab. 43 C; Kuckuck, Beitrage zur 
Kenntnis einiger Ectocarpus-Arten der Kieler 
Fohrde, p. 15. 
f. typica Kuckuck, 1. c. 
f. arcta (Kiitz.) Kuckuck, 1. c. 
f. varians Kuckuck, Ectocarpus siliculosus 
Dillw. sp. forma varians, ein Beispil fur ausser- 
ordentliche Scliwankungen der plurilocularen 
Sporangienform (Berichte deutsch. hot. Gesellsch., 
Band X, 1892, p. 256, taf. XIII). 
Ectocarpus siliculosus is a very variable 
species, and its outward appearance differs 
considerably, hence it is often difficult to dis¬ 
tinguish from the nearest allied Ectocarpus- 
species. 
The specimens referred to f. typica usually 
agree fairly well with Kuckuck’s figs. 1—2, 
1. c., though as a rule it is comparatively rare for their sporangia 
to terminate simply in a long, colourless hair, they being most 
commonly only drawn out into a longer point. The main filaments 
vary from 40 y to 70 y in thickness. 
The specimens referred to f. arcta are particularly characterized 
by their shorter sporangia, and in this they resemble Ectocarpus 
confervoides from which they differ, however, amongst other things 
Fig. 66. Ectocarpus confervoi¬ 
des (Roth) f. pygmcea Aresch. 
Part of a plant with terminal 
sporangium, and portion of a 
filament with lateral sporan¬ 
gia. 80 : 1 and 150 : 1. 
