ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 67 



of Pteridophyta of the Transvaal " in the South African Journal of 

 Science. Those aut!iors enumerated 109 species. Benedict seeks an 

 explanation of the occurrence of sundry north temperate or strictly 

 American species in the Transvaal. 



New Tropical Ferns.* — C. Christensen publishes descriptions of four 

 new ferns, three of which were collected in French Guinea by H. Pobe- 

 guin — Dryopteris adenochlami/s, Lonchitu reducta, Aneimia sessUis 

 (formerly a variety of A. tomentosa) — and the fourth found in Mexico 

 by F. Arsene, Athyrium paucifrons. The types are in the herbarium ^^f 

 Prince Roland Bonaparte at Paris. 



Bryophyta. 



(By A. Gepp.) 



Regeneration in the Hepaticge.f — W. Kreh gives an account of his 

 researches upon the regeneration of hepatic*, ranging over the whole 

 group and treating of every separate organ. All the organs, except 

 perhaps the antheridia, are capable of regeneration ; the antheridia of 

 course are difficult to experiment on. Kreh confirms the statements of 

 Vochting, with few exceptions, namely that in the vegetative shoot of all 

 species regeneration is most usual in the apical part. This is seen in the 

 acrogynous Jungermanniei^ in the great abundance of adventive shoots 

 and their stronger development. The same applies on the whole to the 

 auacrogynous Jungermanniete, only that here the regeneration takes 

 place mostly on the morphological under-surface. In the Marchantia- 

 cefB even the scales regenerate, but with difficulty. The paper is replete 

 with details. 



Development of Pellia.|— H. E. Greenwood gives an account of 

 some stages in the development of PeUia epiphylla, and describes the 

 habit and morphology of the plant and its life-history. In order to 

 determine the more important stages of the latter, material was collected 

 every month, fixed in chromacetic acid, and most carefully washed, de- 

 hydrated and embedded in paraffin for the microtome. Notes on the 

 forty different collectings in chronological order are given. In sum- 

 marizing her results the author points out that : — 1. P. epiphylla occurs 

 in shaded damp localities. 2. The thallusis fleshy, oblong, sinuate, and 

 modified in shape by the pressure of other thalli. 3. The thallus is com- 

 posed of parenchyma and an upper and a lower epidermis, and is abun- 

 dantly rhizoidiferous. 4. The plant is monoicous, with antheridia 

 scattered along the middle of the thallus to the tip, and the archegonia 

 are formed just behind the growing point. 5. The spores are shed 

 towards the end of April ; and the old plants then die down, while new 

 shoots spring from their edges. 6. Antheridia soon appear on these 

 shoots, their early stages being found shortly after the middle of April, 

 and the mature stages during May and June. 7. Archegonia may be 

 found early in June, 8. Fertilization does not occur till early July, or 



* Fedde's Repertorium, ix. (1911) pp. 370-3. 



t Nov. Act. Acad. Carol. Leop. Nat. Cur. Halle, xl. (1909) 86 pp. (3 pis.). See 

 also Zeitschr. Bot., ii. (1910) p. 605. 



X Bryologist, xiv. (1911) pp. 59-70; 77-83 ; 93-100 (6 pis.). 



F 2 



