Jounson—Pogotrichum hibernicum. as) 
together. lachista fucicola, Fries., growing on Fucus vesiculosus 
and Ff. serratus, EH. scutulata, Duby, in the erypts of Himanthalia 
Lorea, and E. pulvinata, Harv., in the crypts of Cystosira ericoides 
and C. discors were found by Sauvageau to be epiphytic only. 
This observer also examined a number of species of Lctocarpus, 
Myrionema, &e., and found eight species of Eetocarpus penetrating 
into their hosts, to produce, by means of endophytic hyphe, new 
tufts or patches of filaments. It would take us too far to give an 
account of these observations. Suffice it to say that six of the 
eight species have their diagnoses published for the first time. 
The species and their hosts are as follows :— 
Ectocarpus velutinus, . . Himanthalia Lorea. 
Ectocarpus minimus, . . H. Lorea. 
Ectocarpus luteolus, . f PEA poral: 
Fucus vesiculosus. 
Elachista clandestina, . . Fucus ceranoides. 
(ictocarpus). 
Kctocarpus brevis, ‘ . Ascophyllum nodosum. 
Ketocarpus Valiantei, . . Cystosira ericoides. 
Taonia atomaria. 
Dictyopteris polypodioides. 
Ceramium rubrum. 
Kictocarpus parasiticus, . ‘ Cystoclonium purpurascens. 
Gracilaria confervoides. 
Gracilaria compressa. 
Gracilaria multipartita. 
Dictyota dichotoma. 
Ectocarpus solitarius, A | 
Kctocarpus investiens, . ‘ 
To return to Pogotrichum hibernicum, a simple inspection of the 
infested A/aria is enough to show that where the larger tufts of 
Pogotrichum hibernicum occur the host thallus has been disturbed, 
and a wart-like swelling produced. Microscopic examination 
shows that this swelling is formed partly of Pogotrichum and 
partly of Alaria, that a gall-like body’ has been formed, just as in 
the case of the parasitism of Hetocarpus Valiantei on Cystosira 
1Gall-like bodies have been described in Rhodymenia palmata, Grev., by Miss 
Barton (Journ. Bot., 1890), and in this and many other Floridex by F. Schmitz, Bot. 
Zeit., 1892, No. 38 (Knéllchenartige Auswiichse an den Sprossen einiger Florideen 
