162 SUMMARY OF CURRENT RESEARCHES RELATING TO 



of Tonkin in 1917. It is very rare and grows among ferns of similar 

 habit. Closely related to Marattia, it differs from that genus by having 

 a linear (not oval) synangium containing far more numerous loculi, a 

 frond which is simply pinnate, and a creeping dorsiventral rhizome. 

 From Archangiopteris it differs in having a synangium. To the genus 

 Archanf/iopteris the author adds two new Tonkinese species — A.subintegra 

 and A. tamdaoensis — both rare and difficult to detect. This genus was 

 first described in 1899, from a plant discovered in Yunnan, A. Henryi ; 

 and a second species, A. Somai, was found in Formosa in 1915. Thus 

 four species of this primitive Marattiaceous genus are now known. 



Genus Tsenitis, with some Notes on the remaining Tsenitidinas. 



— Elizabeth J. Leonard (Scientific Proceedings of the Roycd Dublin 

 Society, 1918, 15, 255-72, 1 pi. and figs.). An account of the struc- 

 ture and phylogeny of Tsenitis Mechnoides, Eschatogramme furcata^ 

 two species of Drymoglossum, Paltonium lanceolatum, and Hijmenolepis 

 spicata. The conclusion arrived at is that these genera are all Blechnoid 

 derivatives, with the possible reservation of Paltonium. The nearest 

 genera to the true Blechnoids w^ould be Tsenitis and Eschatogramme. 

 The rest have diverged more widely in relation to their epiphytic habit, 

 which more or less obscures their Blechnoid affinity ; yet they are all 

 properly to be regarded as offshoots of the Blechnoid series, characterized 

 by the fusion-sorus of intra-marginal position. A. Gr. 



Collections of Madagascar Ferns.— H. V. Rosendahl {Arkivfor 

 Botanilc, 1917, 14, No. 23, 11 pp.). An account of two collections of 

 ferns made in Madagascar by Dr. W. A. Kaudern in 1911-12, and Drs. 

 K.AfzeHus and B. T. Palm (Swedish Madagascar Expedition), 1912-13. 

 The districts visited are described, and are indicated on a chart. A list 

 is given of the 90 species collected, and a distribution table is appended. 



Species and Forms of Equisetum in Sweden.— H. V. Rosendahl 



(Ar Mv for Botanik, im, 15, No. 3, 52 pp., 27 figs.). A systematic 

 account of the forms of Equisetum found in Sweden. Six species and 

 one hybrid belong to the section Phaneropora, and four to Cryptopora. 

 The varieties, sub-varieties and forms are all classified, several being new 

 to science. Numerous figures of habit, structure, etc., are supplied. 



A. G. 



Allies of Selaginella rupestris in S.E. United States.— G. P. 



Van Eseltine {Contrib. U. S. National Herbarium, 1918, 20, part 5,. 

 160-72, 8 pis. and figs.). An analysis of the group of forms allied to 

 Sclaginella rupestris, and growing in the south-east of the United States. 

 Underwood and Hieronymus have already paid attention to the group. 

 But the present author, having studied much herbarium material, has- 

 found two more new species to describe. He treats of eight species 

 in all, and amplifies their descriptions where necessary, giving photo- 

 graphs and text-figures, and providing a key based upon the mega- 

 pores, stems, leaves and their cilia. A. G. 



