— 31 — 



change their name. Schimper was guilty of some strange alterations of name 

 on this reasoning, in our group for example substituting for Astomum Systegium,^ 

 a name which has also been employed by Mitten and others. It has even lived 

 through the second edition of Paris' Index as the accepted name of the genus. 

 Such a substitute name has of course no validity over the prior name for which 

 it is arbitrarily substituted, though it may be noted in this particular case that 

 Astomum had when the substitution was made ceased to be a heterogeneous 

 group, while the original Astomum of Hampe was a conglomerate of cleistocar- 

 pous forms, the first of which, A. rostratum, is unidentifiable^^ and only the second, 

 A. crispum belongs to the genus as afterwards understood. Even in the sense 

 in which it is at present generally applied Hymenostomum has little appropriate- 

 ness. An hymenium plays no role in the European H. rostellatum and one is 

 hardly present in the European H. tortile,^'^ nor in most of the tropical so-called 

 Hymenostomums,^^ which are gymnostomous, not hymenostomous, and were 

 in fact formerly included in the wholly artificial and heterogeneous genus Gymno- 

 stomum, as was for that matter H. micro stomum itself. The hymenium of this 

 group is hardly a structure of phylogenetic importance. 



The genus thus delimited and named would naturally be divided into three 

 subgenera: Astomum, Euhymeno stomum and Weisia, and as these are clearly 

 enough distinguished in our North American species their exact dividing lines 

 need not be further discussed. Astomum is normally cleistocarpous, Euhymeno- 

 stomum is normally hymenostomous, Weisia is normally peristomate. 



Ithaca, N. Y. 



REVIEW 



Contributions (Beitraege) to the Mossflora of Java, the Strait Settlement 

 and Burma, by Hjalmar Moeller 



(In Hedwigia, Band LX, 1919, pp. 313-330) 



This is a list of 206 species of mosses, including descriptions of the following 

 new species: 



Rhizogonium salakanum Moeller, 

 Stereophyllum Moelleri Broth., 



Ectropothecium ichnotocladum (C. M.) Jaeg. var. filivaneum Broth., 

 Xanthocladium scabrifolium Broth. 



All four plants are figured. » 



3"Syn., 30. i860. 



Slit is generally assumed to be A. mstellalum. 



32Limpricht (Op. cit., 22g{.) says that it is ruptured before the operculum is removed and 

 questions (224) the validity of the inclusion of this species in the genus. 

 33Cf. Fleischer, Op. cit., 313. 



