94 MORPHOLOGY AND TAXONOMY, BRYOPHYTES [BoT. Absts., Vol. X, 



603. Davy db Virville, Ad., et Robert Douin. Sur les modifications de la forme et 

 de la structure des hepatiques maintenues submergees dans 1' eau. [Concerning the modifica- 

 tions of form and structure of hepatics broughtabout by maintaining them under water.] Compt. 

 Rend. Acad. Sci. Paris 172: 1305-1308. 1921. — Riccia ciliata, Fegatella conica, Pellia calycina, 

 Calypogeia Trichomanis, Palgiochila asplenioides, and Lophocolea bidentata were studied. 

 They were all found susceptible to adaptation when submersed but showed changes in de- 

 velopment, structure, shape, and direction of growth. If they had been found growing wild 

 in their altered condition they would have been classed as distinct varieties and perhaps as 

 new species, although the genera to which they belonged would still have been recognizable. — 

 C. H. Fan: 



604. Douin, R. Recherches sur les Marchantiees. [Investigations concerning the Mar- 

 chantieae.] Rev. Gen. Bot. 33 : 34-55, 99-145, 190-213. PI. 1-32, 35 fig. 1921.— The 1st chapter 

 of this extensive work discusses the structure of the thallus, the vegetative point, and the 

 methods of branching in the Marchantieae, with illustrative examples; the 2nd describes the 

 structure and development of the sexual branches, both male and female; the 3rd deals with 

 the nutrition of the fruiting bodies, and the 4th with an interpretation of the structures in- 

 volved; the 5th proposes a new classification of the group and gives a critical discussion of its 

 affiliations. From his investigations the author concludes that the thallus develops by the 

 activity of a single initial cell and that the methods of branching are varied, certain methods 

 giving a key to the origin of the male and female inflorescences. He finds that the latter are 

 the products of specialized vegetative points, arising above or below the vegetative point of 

 the thallus, and he uses his deductions as the basis of his new classification, employing certain 

 characters not heretofore used. — J. C. Gilman. 



605. Jansbn, p. Die Bliiten der Laubmoose. Ein Beitrag zur Kenntnis ihrer ausseren 

 und inneren Gestaltung. [The inflorescences of the mosses. A contribution to our knowledge 

 of their external and internal configuration.] Hedwigia 62 : 163-281. 31 fig. 1921. — The author 

 shows that the detailed study of moss inflorescences and of their component parts has been 

 largely neglected by bryologists, in spite of its importance from a taxonomic standpoint. 

 In a series of introductory sections he defends and defines the term "inflorescence" as applied 

 to mosses and gives a general discussion of the distribution of the sex organs; of the component 

 parts of inflorescences and their respective functions; of the perigonial and perigynial leaves; 

 of the antheridia, archegonia, and paraphyses; of the perichaetial leaves; of the numerical 

 and spatial relationships in inflorescences; and of the protective and adaptive arrangements 

 which they sometimes show. The main body of the work, however, is occupied by detailed 

 descriptions and figures drawn from the inflorescences of 28 species of mosses, representing a 

 wide range of genera arranged according to Limpricht. The descriptions and figures bring 

 out the histological features of the involucral and perichaetial leaves, as well as their form and 

 other characteristics, and likewise give the peculiarities of the sex organs themselves. The 

 genera treated are the following, a single species being described except where otherwise in- 

 dicated: Sphagnum, Andreaea (2), Archidium, Dicranum (4), Campylopus, Fissidens (2), 

 Hedwigia, Splachnum, Funaria, Leptobryum, Webera, Mnium (3), Philonotis, Polytrichum, 

 Buxbaumia, Diphysciiim, Fontinalis, Dichelyma, Pterygophyllum, Climacium, and Amblyste- 

 gium. — A. W. Evans. 



606. Jennings, O. E. Hepatics of Iberia (Spain and Portugal). [Rev. of: Casares-Gil, 

 A. Flora Iberica. Briofitas, primera parte. Hepaticas. (Flora of Iberia. Bryophytes, 

 first part. Hepaticae.) Svo., 775 p., 4 pi., 399 fig. Mus. Nacion. Cien. Nat. Madrid, 1919 

 (see Bot. Absts. 8, Entry 2027) .] Bryologist 24 : 30-31 . 1921 .—The reviewer outlines the divi- 

 sions and scope of the work, lists the new combinations proposed, and indicates changes in 

 the generic classification of many species. He commends the illustrations and figures and 

 suggests that the manual ought to prove useful to students of the Hepaticae in the U. S. A. — 

 E. B. Chamberlain. 



