4 Scientific Proceedings, Royal Dublin Society. 
distinct advance was made by Dr. Bornet,’ who followed the 
course of the endophytic filaments of the two species Elachista 
-elandestina, Crouan, and Elachista stellulata, Griff., and saw them 
produce, some distance -off, at the surface of the host-plant, 
daughter tufts identical with the mother plant, from which the 
endophytic stolons had grown. SBornet compared this develop- 
ment with that of endophytic Fungi. The name Herponema, 
proposed in 1880 by J. G. Agardh® for a genus to include three 
species, H. pulvinatum, H. maculans, H. velutinum (Ectocarpus velu- 
tinus, Kiitz.), was adopted, with altered diagnosis, by Hauck* in 
1885 for a group of species of the genus Eetocarpus, in which 
group two of the species are Z. investiens and LE. velutinus, provided, 
as previously mentioned, with endophytic filaments. The last 
addition to our knowledge of parasitic Pheophycee is that made 
by J. Reinke‘ in the Sphacelariacee of which the genus Sphacelia, 
Rke., and five species of Sphacelaria, Liyngb., are described as 
parasitic. Sauvageau commences an account of his own valuable 
investigations with a more detailed description of the parasitism of 
Elachista stellulata, Griff., a species which, in the hands of Dr. 
Bornet, had, in 1875, been the means of a marked addition to our 
knowledge of parasitic Pheosporee. Sauvageau describes how 
the epidermis of the old plant of Dictyota, dichotoma, the host, is 
destroyed, and how the cushion of £. sted/ulata rests on the medul- 
lary layer of the host-plant, sending off radiating stoloniferous 
hyphee which ultimately reach the surface of the host-thallus, and 
give rise to daughter tufts. The parasitic hyphe penetrate into 
the cavities of the host-cells without losing their chromatophores 
or injuring the contents of the host-cells. Similar but less com- 
plete observations were made on Elachista Areschougu, Crn., a 
species which is parasitic on Himanthalia Lorea. In Elachista 
clandestina, Crn., which is considered an Ectocarpus, the endophytic 
hyphe were readily seen connecting external tufts of filaments 
1]. Bornet, “Etudes Phycologiques,’”’ p. 21. It is now known that Elachista 
Areschougii, Crn., not L. clandestina, Crn., was examined. 
2J. G. Agardh, ‘‘ Till Algernes Systematik,’’ p. 55. 
3F. Hauck, ‘‘ Die Meeresalgen,’’ 1885, S. 324. 
4J. Reinke, ‘‘ Uebersicht der bisher bekannten Sphacelariaceen”’ (Ber. d. deut. bot. 
Gesellsch. vir1., S. 201-215). 
