ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
G49 
author found presumptive evidence, but no experimental proof, of the 
genetic connection between this teleutospore-form and the aecidium on 
Pinus excelsa. 
Trametes radiciperda.* * * § — Dr. R. Hartig records the observation of 
the formation of conids in this hymenomycetous fungus. It takes place, 
however, only very rarely and with great difficulty, in artificial nutrient 
solutions. 
Ceriomyces. f — M. J. de Seynes has investigated the structure of the 
fungus-forms included under the genus Ceriomyces , which are in fact the 
pycnids or endocarpous conidiiferous receptacles of species of Polyporus. 
Of the 1600 species of Polyporus , only about 10 are known in their 
Ceriomyces form ; these all belong to the sections Mesopus, Pleurotus, 
Merisma, and Apus, none of them to the section Resupinati. 
Development of Hypogsei.J — Dr. R. Hesse recurs to the description 
of the motile rod-like bodies which he finds throughout the Hymeno- 
gastrese, Tuberaceas, and Elaphomycetes, and which he now terms 
“ swarmers.” In the presence of water these combine with one another 
and form compound swarmers, which, after coming to rest, unite into 
chains ; from these is formed the mycele in all species of Hypogsei. 
The development of the ascospores of the Hypogsei is described 
in the case of Balsamia fragiformis. If the elliptical ascospores 
of this fungus are placed in a drop of water beneath the cover- 
glass, they are seen to be in a state of spontaneous motion, joining in 
pairs by their narrow rounded ends, separating, and again uniting in the 
same way with others. The spores have no cilia ; but this proceeding 
gives the impression as if some substance passed out of one of the spores 
into the other. The whole of the mycele and receptacle of the Hypogsei 
is stated by the author to originate from structures which have a power 
of spontaneous motion. 
The ascospores of this species present remarkable variations in size 
and form, and this is explained by the phenomena which accompany 
their conjugation. When two spores lie side by side, a gradual transfer 
of the contents of one of them into the other takes place; but this 
process may extend over several days. The product of conjugation is at 
first somewhat dumb-bell shaped, but finally oval or spherical. 
Similar phenomena were observed in the ascospores of Hydnocystis f 
and in those of all other Tuberacese and Elaphomycetes examined. 
Mycetozoa. 
Development of Mycetozoa.§ — Mr. A. Lister describes the mode of 
cultivation and life-history of several species of Mycetozoa, especially 
of CJiondrioderma difforme , which was cultivated in several different 
ways, the most successful being by sowing the spores together with seeds 
of cress on moist blotting-paper. The spores of several species germinate 
* SB. Bot. Verein Miinchen, March 10, 1890. See But Centralbl., xlii. (1890) 
pp. 109 and 136. 
t Bull. Soc. Bot. France, xxxvi. (1890) pp. 109 12 
J Bot. Centralbl., xli. (1890) pp. 196-8 (1 fig.) ; and xlii. (1890) pp. 1-4 (5 figs.). 
Cf. this Journal, ante , p. 77. 
§ Ann. of Bot., iv. (1890) pp. 281-98 (1 pi.). 
