64 SUMiMAKY OF CURRENT RESEARCHES RELATING TO 



from Chile belonging to the B. tematum group, and also B. Lunaria 

 var. Dusenii, a new variety from Patagonia. With this variety occurs 

 B. ramosum Aschers., which had been regarded by Prantl as the 

 Patagonian form of B. Lunaria. 



Development of Pteridium.* — T. Lagerberg, having noticed the 

 rapid development of the gametophyte of Pteridium aquilinum from the 

 sown spore, has made a special study of the sexual generation of this 

 species, a subject which had been somewhat neglected. He describes 

 the spores, their structure and germination : the gametophyte in its 

 ^arious stages, its monoecism ; the spermogonia, spermatozoids ; the 

 absence of apogamy ; the typical character of the archegonium ; Farlow's 

 discovery of apospory ; the sporophyte ; the stiiges of development 

 exhibited by the annual leaf as the plant passes from infancy to maturity. 



Morphology of Dennstaedtia.f — H. S. Conard describes the mor- 

 phology of the fern stem as illustrated by Dennstaedtia pnnctilobula. 

 The young sporophyte has a protostele up to the first fork, and above 

 has a tubular stele with internal and external ])hloem, and a sclerotic pith. 

 In the root the endodermis belongs to the cortex, in the stem it belongs 

 to the central cylinder. 



Lepidodendron aculeatum.| — A. C. Seward describes the anatomy 

 of a fossil specimen preserved in the Cambridge Botany School. On its 

 external characters, the form of the leaf cushions, it is referred to 

 Lepidodendron aculeatum Sternb. The record of its original locality is 

 lost. The structure agrees closely with th-dt of Lepidophloios fuliffinosus, 

 save that in the latter the leaf-traces run a horizontal, and not a steeply 

 ascending, course through the middle cortex. The author prefers not to 

 attempt to separate the two genera on purely anatomical evidence. 



Tubicaulis, a British Fossil Fern.§ — M. C. Stopes describes a new 

 fern from the coal measures, Tubicaulis Sutcliffii. The only other 

 known species of the genus was found in the Permian in Germany. 

 The new specimen appears to have been the upper part of a herbaceous 

 fern. The form and structure of the specimen are described. 



Damazio, L. — Une nouvelle fougere du Bresil. (A new Brazilian fern.) 



[Oleandra Bcetce.] Bull. Herb. Boiss., vi. (1906) p. 892. 



GOBTANi, L. & M. — Flora Friulana. (Flora of Friuli.) 



[Treats more particiilarly of the Carnic Alps, and contains a list of 28 ferns 

 and 17 fern allies.] Udine : Doretti, 1906, parte 2, pp. 43-51. 



Regny, v. de, e M. Gortani — Fossili carboniferi del M. Fizznl e del Fiano di 

 Lanza nelle Alpi Camiche. (Fossils of the Coal-Measures of M. Pizzul and of 

 Piano di Lanza in the Carnic Alps.) 



[Treats of the rich fossil flora, 54 p.c. of which are ferns and 20 p.c. are 

 Lycopodinese, in relation to the age of the geological strata in which they 

 are found.] Boll. Soc. Geol. Ital., xxiv. (1905) pp. 461-605 (4 pi,). 



• Arkiv f. Botanik, vi. No. 5 (1906) 28 pp. (5 pis.). 



t Johns Hopkins Univ. Circular, May 1906. See also Bot. Centralbl., cii. (1906) 

 ,645. 

 J Ann. of Bot., rx. (1906) pp. 371-81 (1 pi. and figs.). 

 [§ Mem. Proc. Manchester Lit. Phil. Soc, 1. iii. No. 10 (1906) 2 pis. and figs. 



