78 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
coenobe of from ten to sixteen lanceolate cells attached to one another in 
a radiate manner, similar in structure to those of CJiaracium. The 
development of these from the globular thick-walled warty resting-spores 
has not been observed. The cells do not contain a distinct chromato- 
phore. From these colonies of lanceolate cells are developed either a 
second generation of similar colonies at their apices, somewhat in the 
same manner as in Sciadium, or a colony of spherical resting-spores 
which ends the series; or even a third generation of lanceolate cells 
may be produced in the same way. This is the vegetative mode of 
propagation. But there is also in all probability a mode of sexual 
reproduction similar to that in Hydrodictyon and Pediastrum. Within 
the lanceolate cells are formed gonids ; and, though the escape of 
these has not been actually observed, they are motile, apparently 
biciliate, and probably conjugate in pairs. Under certain conditions 
the lanceolate cells of the first generation gradually pass into a spherical 
form, which appears to be a resting condition. 
Chlamydomonas and Corbierea.* — Referring to Goroschankin’s % 
monograph of Chlamydomonas , M. P. A. Dangeard reaffirms the generic 
distinction between that genus and Corbierea, f dependent on the dif- 
ferent position of the chromatophore. Goroschankin’s Chlamydomonas 
Kuteinikowi he refers to the latter genus. 
Glmotsenium.J — Herr S. Stockmayer describes in detail this rare 
genus of Algae. The mature family is 2-4-celled and round, elliptic or 
kidney-shaped on a surface-view. The 2-celled families have an 
envelope which passes over more or less into jelly. The cells them- 
selves have a thick double membrane ; the special character of the 
genus is a calcareous girdle which passes round the family at its 
broadest diameter, and has a black appearance, from its stronger 
refrangibility than that of the inclosing envelope. The form of the 
chromatophore is not stellate as described by Hansgirg, but bowl-shaped, 
agreeing with that in Pleurococcus, Palmella, Palmophyllum, Gloeocystis, 
Tetraspora, and Nephrocytium. On this and other grounds the author 
dissents from Hansgirg’s location of the genus, along with Spirotsenia, 
&c., as a member of a family Pseudodesmidiaceas intermediate between 
Desmidiacem and Palmellaceas ; and regards its nearest allies as 
Oocystis and Nephrocytium, with which it may form the family 
Nephrocytiefe. 
Fungi. 
Parasitism of Fungi. § — Sig. F. Cavara confirms the observation of 
Prillieux and Delacroix that certain fungi usually saprophytic may 
become parasitic under certain conditions. This was observed in the 
case of the ubiquitous Botrytis vulgaris, which grows on young 
branches of Citrus, as well as on Dahlia and Pelargonium ; while 
Tulipa Gesneriana is attacked by an undescribed species which he 
names B. parasitica. He has also noticed the parasitism of Clado- 
sporium herbarum on the raspberry, on Cycas revoluta, and on Fourcroya 
* Le Botaniste (Dangeard), ii. (1891) pp. 272-4. Cf. this Journal, 1891, p. 631. 
t Cf. this Journal, 1890, p. 489. 
1 Yerhandl. K. K. Zool.-bot. Gesell.Wien,xli. (1891) pp. 21-6 (7 figs.). Cf. this 
Journal, 1890, p. 752. § Rev. Mycol., xiii. (1891) pp. 177-80. 
