92 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Ectocarpus.* — M. C. Sauvageau has studied the structure and de- 
velopment of Ectocarpus pusillus, of which he makes four distinct varieties, 
epiphytic or endophytic on different seaweeds ; the distinction between 
these varieties being largely dependent on the host- plant, and on the 
habit of the Ectocarpus , whether epiphytic or endophytic. All the 
varieties agree with one another in the form of the plurilocular sporanges, 
in the size of the spores, in the presence of clamping filaments, and in 
the appearance of the chromatophores. E. Battersii is also described in 
detail, with its Mediterranean variety. 
Plurilocular Sporanges of Asperococcus.f — M. C. Sauvageau has 
detected the plurilocular zoosporanges of Asperococcus compressus, which 
had not previously been observed. They are not collected into definite 
sori, but form confluent plates of indeterminate shape, clothing almost 
the entire surface of the frond. 
Radaisia, a new Genus of Myxophyceae.J — M. C. Sauvageau 
separates his Entophysalis Gornuaua from the genus, making it now the 
type of a new genus Radaisia, with the following diagnosis : — Thallus 
horizontaliter expansus, minutus, inferiore pagina adnatus, filis verti- 
calibus simplicibus v. fastigiatim subdichotomis, densissime stipatis, e 
cellulis numerosis subcompressis, intra vaginam firmiorem crassam 
seriatim nidulantibus formatis, coutextus ; sporangia sphasrica v. oblonga, 
e transformatione celluhe terminalis v. intercalaris orta, solitaria v. 
pluries superposita, sporas numerosas minutissimas inter perisporium 
crassum lamellosum continentia. Another new species, R. Gomontiana, 
was found on species of Fucus at Biarritz. While Entophysalis remains 
among the Coccogoneaa Chroococeacese, Radaisia must be placed among 
the Coccogoneae Chamaesiphonaceae. 
Hariotina.§ — Prof. R. Chodat and M. F. Huber have studied the 
development of this genus of Algse. They consider that Dangeard is in 
error in placing it among the Volvocineae, having mistaken for the 
sculpture of a membrane of the mother-cell what is in reality the 
skeleton of the cells of the mother-colony, in other words, the network 
which unites the daughter-colonies. The authors regard Hariotina as 
having, like Ccelastrum, lost the faculty of producing mobile elements, 
being in fact a term in the series of Pediastreae, parallel to Ccelastrum 
among the Volvocineae. 
Fungi. 
Symbiosis among Fungi. || — M. P. A. Dangeard records a remarkable 
example of symbiotic growth in Fungi, in which Dacryomyces deli- 
quescens and an undetermined species of Tremellini had their hyphae so 
densely interwoven that the characteristic basids of the two fungi 
appeared side by side on the same hymenium. 
t Boring of Membranes by Fungi.t — M. M. Miyoshi has experimented 
on the power of the filaments of fungi to penetrate solid membranes. 
* Journ. de Bot. (Morot), ix. (1895) pp. 274-80, 281-91, 307-18 (20 figs.). 
t Tom. cit., pp. 33f5-8 (1 fig.). X Tom. cit., pp. 372-6 (1 fig.). 
§ Bull. Soc. Bot. France, xli. (1895) Sess. Extraord., pp. cxlii.-vi. (6 figs.). Cf. 
this Journal, 1890, p. 489. 
|| Le Botaniste, (Dangeard) iv. (1895) pp. 182-7 (1 fig.). 
Jahrb. f. wiss. Bot. (Pfeft'er u. Strasburger) xxviii. (1895) pp. 2G9-89 (3 figs.). 
