REVUE BRYOLOGIQUE 35 



Correns (Untersuch.iiber die Vermehrung der Laub- 

 moose durch Brutorgane und Stecklinge, p. 112 (1899) 

 gives a full and interesting description of the gemmae of 

 G. anomala and G. Hartmani, and remarks that the two 

 are hardly distinguishable. This author also maintains 

 that G. Hartmani and G. anomala are too closely allied 

 to be separated generically, and points out that the chief 

 generic character on which Dr7/ptodo?2(the genus in which 

 Limpricht places G. Hartmani) is based^ viz, the absence 

 of a central strand in the stem, is in the genus Plagiothe- 

 ciiim recognised as of insufficient generic value. I am 

 strongly in favour of this view of Correns, and in support 

 of the same it may be remarked that the impossibility of 

 considering the absence or presence of this central strand 

 as a character of generic value is well seen in the genus 

 Encalypta^ where the strand is strong in some species, 

 but wanting in others ; also, the strand is present in 

 Hypniim intermedium etc., absent in H. vermcosum. 



Correns also remarks (p. 113) that he examined speci- 

 mens of Grimmia phyllantha Lindb., and found that they 

 agreed so well with G. anomala that he felt bound to 

 consider the tw^o as in all probability identical. G. phyl- 

 lantha was founded in 1892 by Lindberg in Broth. Enum. 

 Muse. Gaucas, p. 83, on specimens of a barren gemmife- 

 rous moss from Transcaucasia (Radscha, in monte Bereleti 

 pr. Uzeri, ad saxa regionis alpinae). Lindberg remarked 

 on the species. « A Grimmia aqnatica^ habitu simili, 

 areolatione foliorum raptim dignoscitur, a G. Hartmani 

 foliis obtusis jam recedit. )> I have compared authentic 

 specimens of G. phyllantha (in the Kew Herbarium) with 

 Schimper's and the Mer de Glace specimens of G- anomala^ 

 and have no hesitation in confirming Correns' opinion 

 that the two belong to the same species. The occurrence 

 of G. anomala in a locality so far removed from its Euro- 

 pean ones is very interesting. 



Through the kindness of Sir James Stirling and WR, N. 

 J)ixon I have been able to place the specimens of G. ano- 

 mala referred to from France and Sweden in the Kew 

 Herbarium for reference. E. S. Salmon. 



Charlton House, Kew (England), Mar. 5, 1900. 



Explanation of Plate 



Fig. 1. Grimmia Hartmani Scbpr., transverse section of 



stem, showing absence of central strand (X i*0). 

 )) 2-19. G, anomala Hpe. mss. Schpr. 

 )) 2. Transverse sectioa of stem, showing central-strand 



(X270). 



