ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
761 
Apospory in Lastrea.* * * § — A fresh example of apospory is described 
by Mr. C. T. Druery in the case of a species of Lastrea , probably 
L. pseudo-mas var. cristata. It occurs in a young seedling only just 
emerged from the prothallium. 
Structure of Lepidodendron. — From a careful examination of 
specimens of Lepidodendron selaginoides , M. M. Hovelacque f confirms 
his previous conclusion that this plant was a vascular cryptogam with 
centradesmid bundles. 
Herr H. Potonief describes the structure of the leaf-cushions of 
Lepidodendron and Lepidophloios. The latter of these genera differs 
from the former in the cushions projecting strongly like the scales of 
a fir-cone. They are imbricated, but point downwards instead of 
upwards. 
Muscineae. 
Arrangement of Hepatic®. § — Mr. A. W. Evans gives a synopsis of 
the genera as at present accepted, 117 in number, with their complicated 
synonymy. They are classified into 4 orders, Jungermanniaceae, 
Anthocerotacese, Marcliantiaceae, and Ricciaceae. The Jungermanniaceae 
comprise 11 tribes, viz. Frullanieae (7 gen.), Ptilidieae (9 gen.), 
Lepidozieae (18 gen.), Saccogyneae (3 gen.), Jungermannieae (19 gen.), 
Coeocauleae (8 gen.), Acrobolbeae (6 gen.), Fossombronieae (14 gen.), 
Monocleae (1 gen.), Metzgerieae (1 gen.), and Aneureae (1 gen.) The 
Anthocerotaceae are made up of 3 genera. The Marchantiaceae comprise 
3 tribes, viz. Marchantieae (15 gen.), Lunularieae (2 gen.), and Tar- 
gionieae (2 gen.). The Ricciaceae include 2 tribes, the Riccieae (5 gen.), 
and the Sphaerocarpeae (3 gen.). 
Rudimentary Hepatic3e.|| — Prof. E. Goebel describes several species 
of Hepaticae in which a very simple structure is associated with a great 
reduction in size of both the sexual and the non-sexual generation. 
Protocephalozia ephemeroides. The protoneme is here persistent, as 
in Ephemerum among Musci ; the leafy shoot arising as an appendage 
to the protoneme. The protoneme consists of two parts, underground 
and aerial, the former being destitute of chlorophyll ; the sexual shoots 
spring from the lower part of the aerial filaments. 
Pteropsiella frondiformis. This presents an intermediate form 
between the thallose and the foliose Hepaticae, the stem-leaves being 
replaced by a broad green wing. On the ventral side of the thallus 
are very rudimentary amphigasters. The thallose shoot has a three- 
sided pyramidal apical cell as in the foliose forms. It is properly 
a foliose form in which the lateral leaves have a horizontal position 
and are coalescent, but with two hairlike appendages on the margin of 
the thallus. 
Ijejeunia Metzgeriopsis. A minute epiphytic dioecious liverwort, form- 
erly described as Metzgeriopsis pusilla. The thallus is here simply a 
higher development of the protoneme, bearing rows of cells which are 
* Journ. Linn. Soc. (Bot.), xxix. (1893) pp. 479-82 (1 pi.). 
f Bull. Soc. Bot. France, xl. (1893) pp. 48-55. Cf. this Journal, 1892, p. 237. 
i Ber. Deutsch. Bot. Gesell., xi. (1893) pp. 314-26 (1 pi.). 
§ Trans. Connecticut Acad. Arts and Sci., viii. (1893) pp. 262-80. 
|| Flora, lxxvii. (1893) pp. 82-103 (1 pi. and 20 figs.). 
