458 SUMMARY OF CURRENT RESEARCHES RELATING TO 



"White, D. — Fossil plants of the group Cycadofilices. 



[Descriptions are given of ten types generally regarded as ('ycadofilic. 

 after which the author treats of certain types which are also 

 probably Cycadofilic. Finally, he discusses shortly the origin of 

 the group.] Tom. tit., pp. 377-90 (3 pis.). 



Yabe. Y. — Trichomanes Formosense et Loochooense. 



[A list of 15 species of Trichomanes collected by K. Miyake in Formosa and 

 the Liukiu Islands, with descriptions of three new species — T. formosanum. 

 T. Miyakei, and T. liukiuense.~\ Tokyo Bot. Mag., xix. (1905) 



pp. 31-5 (1 fig.). 



Zeiller, K.— Sur la decouverte de stations nouvelles des Trichomanes radicans 



dans les Basses-Pyrenees. (On the discovery of new localities for T. radicans in 



the Lower Pyrenees.) Bull. Soc. Bot. France, Hi. (1905) pp. (35-7. 



Bryophyta. 



(By A. Gepp.) 



Researches on some Liverworts.* — E. Lampa publishes further 

 results of her studies on the Hepaticae. She finds that the stem of a 

 hepatic, whether thalloid or leafy, arises by division of a cell of the 

 germinating filament, generally the apical cell, into three segments — not 

 into four as is generally believed. The division takes place by the 

 formation of two more or less vertical walls in the apical cell, dividing 

 it into three ; and from the third segment a typical growing point is 

 formed by a further division into two. The author has never seen any 

 instance of the quadrant-division described in literature. She has grown 

 many cultures from spores, both under a top light and a side light, and 

 she describes her results. She finds that the formation of germinating 

 threads from the plant under unfavourable conditions of light is by no 

 means confined to quite young stages of the plant, for she has observed 

 such threads arising from large plants of Hepatics, as well as from fairly 

 large fern-prothallia. The germinating filaments of Hepatic^ are com- 

 pared with the protonema of mosses. The development of the following 

 species from the spore is dealt with in detail : — Duvalia rupestris, Riceia 

 glanca, Pellia endivkefolia, Blyttia Lyellii, Lophocolea het&rophylia. The 

 author has also studied the question of the position of the sexual genera- 

 tion of Hepaticas, and compares the youngest stage of the gametophyte 

 of certain acrogynous Jungermanniacese with a similar stage in Mosses. 

 She passes on to the thalloid and other Hepatics, and discusses the early 

 stages of their development, the three-sided segmentation and the reduced 

 foliar organs tristichously arranged, which are found in the early stage 

 of Marchantia and other thalloid genera, but disappear subsequently. 

 This tristichous development characterises the early stages of all Hepatics, 

 though it disappears later in the thalloid forms. Fern-prothallia show 

 signs of division into stem and leaf, the explanation of which is forth- 

 coming from a study of the ontogenesis of Marchantiaceae. 



Moss-Sporogonium Compared with Fern - Plant.f — Leclerc du 

 Sablon publishes an account of some researches on the development of 

 the sporogonium of Mosses in continuation of Kienitz-Gerloff's work, 

 and with a view to confirming Vuillemin's comparison of the moss- 



* SB. K. Akad. Wiss. Math. Nat. Wien, cxii. (1903) pp. 779-92 (4 pis.). 

 t Rev. Gen. Bot., xvii. (1905) pp. 193-7 (figs.). 



