ee 
~~ 
AND COILODESME CALIFORNICA. 671 
Botanique,’ describes this alga, under the name Llachistea 
Areschougii, as forming very small tufts, with a cushion of large 
torulose colourless cells, deeply sunk in the host-thallus. The 
short filaments are incurved and narrow at the base, while the 
long ones are of the same thickness throughout their whole 
length; and the pyriform sporangia are of the same dimensions as 
those of F. elandestina, but sometimes attain a length of 120 p. 
Both the sporangia and the filaments arise on a level with the 
surface of the host-plant. M. Sauvageau also states that in 
many cases the cells of the base, and almost invariably those 
forming the lateral walls of the cavity in Himanthalia occupied 
by the parasite, appear to be undisturbed by contact with it, 
though the 1-3 epidermal layers surrounding it frequently appear 
compressed, as if there had been a neck to the cavity, and this 
had been widened by the growth of If. Areschougii. Hence, 
though he has never observed the young stages, he supposes 
that Mf. Areschougii is developed in a cryptostoma or conceptacle 
of the host-piant. He noticed a few distorted filaments given 
off from the base of the cushion, with joints about 10-25 y wide 
by 25 x long passing between the host-cells. He followed one 
of these stolons, as he calls them, for more than 600 » across 
the central tissue of the host, but was unable to determine 
its destination; however, M. Sauvageau suggests that these 
“stolons” may connect the tufts with each other, and so help to 
propagate the plant. He also suggests that in the first instance 
the host-plant may be infected by the germination of the zoo- 
spores of M. Areschougii in the conceptacles or eryptostomata. 
Some young individuals which he observed were evidently 
growing up from the interior of the thallus, but owing to the 
state of the preparation he was not able to recognize the ento- 
phytic filaments. No figures are given of this species. 
It was suggested to me that it might be possible to clear up 
some of the points left doubtful by M. Sauvageau, and in 
September some material was sent to me from Cumbrae, where 
it was very plentiful, while later in the year more specimens 
were obtained from N. Berwick and Port Erin. 
Hoping to be able to follow out the life-history of A. Are- 
schougii during the winter, some Himanthalia lorea were obtained 
in December from Port Erin, and in January from Cumbrae, 
but in neither case could any trace of the parasite be found. 
Tn March some H. lorea from Cumbrae were again examined, and 
yy 3 D 
LINN. JOURN.—BOTANY, VOL, XXXV. 3 
