ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
211 
Fungi belonging to tlie Plialloidese. The whole of the tissues are 
derived, by internal differentiation, from the medullary and cortical 
tissues of the medullary strand. The medullary portion gives rise to 
the column of gelatinous tissue in the main cavity of the stipe, to the 
more persistent forms of this tissue which constitute the diaphragm and 
the zone, to the entire mass of the glebe, and to the gelatinous and outer 
layers of the peridium . The cortical layer gives rise to the outer wall 
of the peridium, to the cortical plates, and to the cortical sheath of loose 
tissue outside the stipe. The receptacle is formed by the joint action 
of the cortical and medullary tissues. 
Mycetozoa. 
New Myxomycetes.* — Under the names Kleistobolus pusillus and 
Didymium oculatum, Herr C. Lippert describes two new species of 
Myxomycetes, both found on dead pine-wood. Kleistobolus forms a new 
genus with solitary spherical sessile sporanges, the opercule circular 
with toothed margin, a double peridium, and rudimentary capillitium 
consisting only of a few short tubes. 
Lister’s Mycetozoa. j — Mr. A. Lister publishes a descriptive cata- 
logue of the species of Mycetozoa in the herbarium of the British 
Museum, with briefer descriptions of all other known species, forming 
therefore a monograph of the group. The work commences with an 
account of the general structure and modes of reproduction of the 
Mycetozoa, the process of karyokinesis in the nuclei being especially 
dwelt on. The group is divided into two sub-classes, the Exosporese 
and the Endosporese, the former comprising one order, the Ceratio- 
myxaceBS, the latter twelve, viz. the Physaracem, Didymiaceae, Stemoni- 
taceae, Amaurochaetaceas, Heterodermaceae, Liceaceae, Tubulinaceae, Reti- 
culariaceae, Trichiaceae, Arcyriaceae, Margaritaceae, and Lycogalaceae. 
To each order is prefixed a key to the genera, and to each genus a key 
to the species. The illustrations, which are entirely from nature, are a 
very valuable feature of the work. 
Germination of Myxomycetes. — In Labyrinthula Cienkowshii, para- 
sitic on Vaucheria terrestris , Prof. W. Zopf J finds that the cysts are 
always invested with a double membrane. On germination, these cysts 
produce, not swarm-spores, but amoebte, the protoplasm putting out one 
or two pseudopodes, which pierce the membrane of the cyst. The 
amoebae not unfrequently remain for a considerable time within the cyst 
before escaping, carrying it with them in their movements. 
Mr. A. J. M‘Clatchie § states that the spores of some Myxomycetes, 
especially Keticularia umbrina, germinate very rapidly in ordinary 
drinking or in distilled water, in some cases within an hour. 
* Verhandl. K. K. Zool.-Bot. Gesell. Wien, xliv. (1894) pp. 70-4 (2 pis.). 
[h» t Monograph of the Mycetozoa. London, 8vo, 1894, 224 pp., 78 pis. and 51 figs. 
t Beitr. z. Phys. u. Morph, niederer Organismen (Zopf), Heft 4 (1894) pp. GO-2 
(2_figs.). § Bot. Gazette, xis. (1894) pp. 245-6. 
