318 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
of the microgametes exhibit no essential difference. The cell-wall is 
striated, the striation consisting of two intercrossing systems of lines. 
The cilia are inserted in a tubular sheath. The pulsating vacuoles 
remain for a time in the zygotes. The author unites with Clilorogonium 
Dangeard’s genus Cercidium. 
New Gongrosira.* — Under the name Gongrosira trentepohliopsis, 
Herr W. Schmidle describes a new species of this genus with two 
different forms of zoosporange, one of which bears a close resemblance 
to those of Trentepohlia. Different species of Gongrosira are regarded 
by algologists as stages of development of species belonging to Vaucheria , 
Cladophora, and other species of algae. 
TJroglena.j — Mr. G. T. Moore gives the following amended descrip- 
tion of the remarkable organism Uroglena americana , which he con- 
siders (if a plant) to belong to the multicellular Chrysomonadaceae of 
the class Syngeneticae : — Coenobe irregularly spherical, varying greatly 
in shape and size, averaging 200-300 p ; no peripheral canals nor in- 
ternal network of threads; revolving slowly through the water by 
means of the cilia of individual cells ; individual cells spherical or 
occasionally slightly elliptical, never produced into an appendage at 
the end towards the centre of the colony ; two cilia of unequal length, 
15-20 p and 2-4 /x respectively, the longer one with decided undulatory 
motion ; a red spot at the base of the cilia, and a single chromatophore 
of a yellowish-green colour, usually occupying one side of the cell 
and clinging close to its wall ; nucleus, non-contractile vacuoles, and 
numerous oil-globules present. Under certain conditions it is possible 
for an individual cell to lose its cilia, and to go into a resting stage, 
often forming a thick gelatinous wall. No mode of sexual reproduction 
was observed. 
Coccospheres and Rhabdospheres.J — Mr. G. Murray and Mr. V. 
H. Blackman record the dredging of these organisms, which they regard 
as incrusted Algae, from the West Indian seas. In the coccospheres the 
calcareous scales or coccoliths overlap each other. This arrangement, 
unlike that of diatoms, admits of the growth of the organism. Each 
coccolith is attached to the cell by a button-like projection on its inner 
surface. In the rhabdospheres with projecting rods, the plates do not 
fit into each other, but their bases are imbedded in the surface of the 
cell, each by itself without contact. A granular protoplasmic substance 
was detected within both the coccospheres and the rhabdospheres, but 
no colouring matter. 
Eungl. 
Endophytic Mycorhiza.§ — M. J. M. Janse has examined the roots 
of 75 species of plants (including Gymnosperms, Pteridophyta, and one 
liverwort) in the forests of tropical Java, and finds 69 of them in- 
fested with an endophytic mycorhiza, the arborescent species examined 
affording no exception. The filaments offer a close resemblance in all 
cases; and the author discusses the resemblances and differences between 
* Oesterr. Bot. Zeitsclir., xlvii. (1897) pp. 41-4 (1 fig.), 
f Bot. Gazette, xxiii. (1897) pp. 105-12 (1 pi.), 
j Nature, lv. (1897) pp. 510-11 (8 figs.). 
§ Ann. Jard. Bot. Buitenzorg, xiv. (1896) pp. 53-201 (10 pis.). 
