234 THE JOURNAL OF BOTANY 



stipules often bifid, bracts bi-tfi-dentate, mouth of perianth spinulose- 

 denticulate ; whereas P. interruptum is a smaller, more robust plant, 

 with entire leaves and bracts, the mouth of perianth having a few 

 coarse large teeth. It is true that on what I should call typical 

 P. fyrenaicmn there are to be found entire leaves, and that the 

 specimens distributed in Massalongo's Hep. It. Ven. n. 79 as Plagio- 

 chila interrupta var. pyrenaica have leaves entire, but have the 

 mouth of perianth spinulose-denticulate, although in the large size and 

 delicate texture they agree well with typical P. fyrenaicum. But 

 I am now of opinion that P. pyrenaicum, if not regarded as a distinct 

 species, is a remarkable variety of P. interrxiptum. 



In my notes on P. interruptum (1. c.) I only mention Chilo- 

 scyphus polyanthus as likely to be confused with it. I should, 

 however, now state that the small variety of Plagiochila asplenioides 

 is more frequently mistaken for it, though the absence of stipules 

 and the almost constant presence of some denticulate leaves help to 

 separate the two species. 



The specimens of Pedinophyllum in the Manchester Museum fall 

 into three groups : — • 



(1) P. INTERRUPTUM Gottsche & Rabenhorst .... Hep. Eur. 

 nos. 36, 48, 109, 136, &316; Massal. Hep. It. Ven. no. 78 as Plagio- 

 chila interrupta forma rohusta ; Carr. & Pears. Hep. Brit. no. 86 

 (some of the young stems have bidentate leaves) ; Schiffn. Hep. E\ir. 

 nos. 238-40 ; Austin, Hep. Bor. Am. no. 6 as Plagiochila macrostoma 

 SuU. ; Leptoscyphus inter ruptus ex herb. Lindberg ; near the Strid, 

 Bolton Woods, Carrington ; as Jungermannia subapicalis viticuli- 

 formis Baumannshohle, ex herb. Hampe ; Millers Dale, Chee Dale, 

 Derbyshire, G. A. Holt; Windermere, Carrington, 1859; Bolton 

 Woods, Ingham, Aug. 1900. 



(2) P. PYRENAICUM (Spruce). Schiffn. Hep. Eur. no. 241 as 

 P. interruptum \2^y. pyrenaicum, Pyrenees, I>r, I)o%un \ Shady rocks, 

 Benbulben, Co. Sligo, May 1871 ; Glenade, Co. Leitrim, July 1913, 

 J. Hunter; J. polymorpha Carrington, Malham, July 10th, 1857, 

 " Seems a good species " Gottsche in letter Nov. 1861 (some of the 

 leaves are entire and others bidentate, intermediate form). 



(3) The following specimens in the collection, under the name 

 of P. interruptum, are to be referred to other species : — 



Plagiochila macrostoma Herb. Austin. " I find no stipules, but 

 in general habit it is near the Ohio plant " Austin ; Lindberg rightly 

 referred P. macrostoma Sull. to P. interrupta, but this plant is 

 quite different. Ravensdale, Derbyshire, G. A. Holt, May 1883 ; 

 this is a small form of Aplozia riparia, with perianths, specimen 

 evidently transposed. 



P. interrupta, Canada, Macotin, Herb. Austin ; P. interrupta, 

 Ptarmigan, Scotland, C. J. Wild, Aug. 1878; P. interrupta, ex 

 Herb. Lindberg: these three belong to Plagioclii/a, not to Pedino- 

 phylhim; Carrington has written on the packet of the last "■ Ade- 

 Ian thus? " 



P. interrupta, on naked earth, Whitbarrow, G. Stabler, Sept. 

 1872; this is a form of P. asplenioides, as Carrington notes. 



