32 _ 1. HAGEN. [19U 



(leux i)arties, landis (jue je navais rien })li observer de semblable 

 chez le Pseudephemenim. Je nosai ])as, cependanl, affirmer avec 

 certitiide cette ditterence parce que les matériaux ([ue je possé- 

 dais de cette espéce, iiétaient pas dans de bonnes conditions 

 ponr décider de la (juestion; c'est ponr([oi jinvitais dantres 

 bryologues å s'en sonvenir les cas échéant. Mon ap])el a été 

 entendu par M. Dixon qui mécrit ceci: 



<Some lime ago I had some good material ol" Pleuvidiiim 

 a.villare sent me with fresh frnit, just maturing; and I took the 

 opportunity of examining several capsules to see if I could find 

 the specialized band ol' cells to which you refer (Norges Cerato- 

 dontaceæ, p. 45). I thought at first Ihat I had observed some- 

 thing of the nature described; but after careful examination I 

 found that it was illusory, and I was quite unable to detect 

 any differentiated tissu around the capsule at the point where 

 dehiscence took place.» 



D'aprés ees observations de notre excellent confrére anglais 

 nons sommes autorisés a ajouter aux caractéres différentiels des 

 deux genres ce caractére: la chute de la capsule s'opére, chez 

 lun de genres, au moyen dune couche interposée de cellules 

 hyalines freles, structure qui manque au contraire å lautre. 



Anisothecium Mitt 



. \ Folia squarrosa 2 



/ Folia patula — homomalla — secunda 5 



i^ \ Folia ovato-lanceolata; costa sub apice dissoluta A. palnstre 



} Folia cito in cuspidem contracta, costa excurrens. . . . :> 



., \ Capsula erecta, regularis A. vaginale 



} Capsula inclinata, gibbosa 4 



. S Capsula lævis A. crispuin 



/ Capsula plicata A. Grcvilleanum 



- ^ Folia margine reflexa A. rubruin 



I Folia margine recta (> 



t Costa excnrrens; capsula arcuata A. hnmile 



6 > Costa cum vel in apice dissoluta, capsula erecta, regularis 



f .4. nifescens. 



Anisothecium rufescens i^ Dicks.) Lindb. 

 Er først anført som norsk i Angstrøms Disp. Muse. Scand. 

 (1842); det eneste undersøkte norske eksemplar, som er ind- 

 samlet før dette år, hitrører fra M. N. Blytt (1827). 



