ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
633 
to special host-plants, were at an earlier period capable of existing upon 
more than one, and answers the question in the affirmative. Instances 
are named belonging to several different genera in which this was pro- 
bably the case. These hetercecious species became gradually limited, 
in the course of their development, to a single host-plant. Herr Dietel is 
acquainted with only one species — Puccinia JDayi Clint. ( = P. JDieteliana 
Syd., P. lirnosa Magn.), in which, in addition to the hetercecious form 
and that in which aecidia are unknown, there is also an autoecious form 
with aecidia. 
Brown Rust of Cereals.* — In an exhaustive investigation of the 
fungus which causes the brown rust of cereals, Puccinia rubigo-vera , 
Herr J. Eriksson proposes to split it up into six species, the first only 
of which is known in the aecidiospore stage : — (1) P. dispersa ( JEcidium 
Anchusse on Anchusa arvensis and A. officinalis ), Uredo dispersa on Secale 
cereale and S. montanum ; (2) P. triticina sp. n. on Triticum compactum , 
dicoccum, Spelta , and vulgar e ; (3) P. bromina sp. n. on many species of 
Bromus ; (4) P. agropijrina sp. n. on Triticum repens ; (5) P. liolcina 
sp. n. on Holcus lanatus and mollis ; (6) P. Triseti sp. n. on Trisetum 
flavescens. Of these the first and second only are of great importance 
in agriculture, the first being very destructive to rye, and the second 
being apparently the only species which causes rust on wheat in Europe, 
the United States, and Australia. 
Rabenhorst’s Cryptogamic Flora of Germany (Fungi imper- 
fecti). — The two most recently published parts of this work (Lief. 65, 
66) continue the enumeration and description of the SpJiserioide se. The 
genus Aposphseria is completed with a total list of 60 species ; then 
follow DendropJioma (35 sp.), Asteromella (5 sp.), Grocicreas (2 sp.), 
Sclerotiopsis (1 sp.), Plenodomus (4 sp.), My cogala (2 sp.), Sphseronema 
(61 sp.), Glutinium (2 sp.), Neottiospora (2 sp.), Sirococcus (4 sp.), Cliseto- 
phoma (i 1 sp.), Asteroma (86 sp.), Cicinnobolus (7 sp.), Byssocystis (1 sp.), 
Muncularia (1 sp.), Staurochsete (1 sp.), Pyrenochseta (21 sp.), and Vermi- 
cularia , of which 48 sp. are described. 
Protophyta. 
a. Schizopliycese. 
New Genera of Schizophycese.j - — Herr E. Lemmermann describes 
the plankton algae collected in Prof. Schauinsland’s voyage in the Pacific 
in 1896, 97. Yery extensive lists] from different localities are given, 
the Peridinieae being included in the enumeration, and the general fea- 
tures are pointed out of the plankton flora of the Pacific Ocean. The 
following are new genera of Schizophyceae. 
Codospliseriopsis. Cells spherical or elongated, enclosed in a gela- 
tinous sheath, distributed in a single layer over the surface of gelatinous 
hollow spheres, which are combined into botryoid colonies ; multiplica- 
tion of the cells by division of the spheres in the form of budding. 
Chondrocystis. T'hallus expanded, a foot high, forming cushions 
visible to the naked eye, soft, cartilaginous, easily broken up, often cal- 
cified below, wrinkled on the surface, composed of a number of separate 
* Ann. Sci. Nat. (Bot.), ix. (1899) pp. 241-88 (3 pis.). Cf. this Journal, 1895, 
pp. 84, 209. t Abhaudl. Nat. Yer. Bremen, xvi. (1899) pp. 311-98 (3 pis.). 
