Wilson : hypnum Aduncum and its allies. 



51 



lixPNUM Sendnerl Schimper. This as a Britisli moss, has hitherto 

 been confounded, as it was long ago, by Dr. Bwartz, with Hypiiuvi revolvens, 

 from which it is distinguished by its pinnatedly branched stems, and dioicous 

 inflorescence. — In character it is intermediate between It. revolmns^ and H. 

 Wilsoni, and is probably frequent in Britain. Fertile specimens are to be 

 seen in the Hookerian Herbarium^ gathered by Mr. Borrer, in Amberley Bog, 

 Sussex, in 1813. It occurs on Hale Moss, Cheshire, and near Southport, 

 (female plants only, and consequently barren), and is recommended to the 

 notice of field-bryologistSi 



Hypnum Wilsonl Schimper. H. aduncum^ Bryol. Europ. In June 

 1858, this moss was rather plentiful, with fruit, near Ainsdale, but has not since 

 been found except in a barren state. It is a larger moss than H. Sendneri, 

 with fewer branches, and the leaves less crowded, and of lax texture at the 

 base. 



It is not accurately figured in Bryol. Europ., as to the enlarged cellules 

 there represented at the marginal base of the leaf : indeed ( judging from a 

 specimen of H. aduncum, received from Dr. Schimper consisting partly of 

 this, and partly of H. exannulatum,) it would seem that the figure 5. K 

 has been inadvertently drawn from a leaf of H. exannulatum ; for^ in Dn 

 Scliimper's own specimen of aduncum, the alar cellules are usually less^ con-- 

 spicuous than in the Southport specimens, and the nerve also thinner. 



In Dr. Schimpers specimen the leaves of H. aduncum (Wihoni) though 

 not longer than those of exannulatnm, are more than twice as wide, more con- 

 cave, and quite destitute of striae, both in a wet and in a dry state ; they are 

 •ovate-lanceolate (those of exannulatum being linear-lanceolate and less falcate) 

 but except in the thinner nerve, and less prolonged acuminated summit, 

 not obviously different from the Southport moss ; — at fig. 5. and 6. in 

 Bryol. Europ., the leaf is represented too wide at the base, and the leaf is 

 consequently given as ovate-accuminate, instead of ovate-lanceolate, having 

 the widest part considerably above the base, as in H. Sendneri, the leaves of 

 "which are scarcely to be distinguished from those of Wilsoni, except in being 

 usually narrower, more crowded, and with narrower and more linear areola- 

 tion towards the base, where the enlarged cellules (so conspicuous in H. 

 'exannulaftum,) are usually wanting or obsolete. 



Hypnum exannulatum. Bryol. Europ. This moss is described in 

 Bryol. Brit, under the name of H. aduncum, first found with ripe fruit on 

 Baguley Moor, in April 1831, and was then, and at the time of the pubhcation 

 ^f Bryol. Brit., the only known moss in Britain which could be well referred 



