

ZYGODON. 71 



dimidiate calyptra, exactly as Weissia is distinguished from 

 Grimmia, and Didymodon from Tricfiostormim. 



Z. conoideum. (TAB. XXI.) 



Bryum conoideum. Dicks. Plant. Crypt, fuse. 4. t. 11./.2. Turn. 

 Muse. Hib. p. 112. Mnium conoideum. Engl. Bot. t. 1239. Gymno- 

 cephalus conoides. Schivaegr. Suppl. pars 2. p. 87. 



HAB. Trunks of trees near Inverary, Scotland. Mr, 

 Dickson. Pear-trees at Orange Grove, near Belfast. Mr. 

 Templeton. Near Manchester. Mr. Hobson. 



The stems, as we have seen them on the trees in Mr. 

 Templeton's orchard near Belfast, grow in a tufted manner, 

 like Gymnostomam viridissimum, but rarely exceed half an 

 inch in length. Leaves erecto-patent, between ovate and 

 lanceolate, plane or slightly keeled, entire; the nerve 

 reaching to the point. The texture is compact, clotted, ex- 

 actly as in the leaves of Gymnostomum viridissimum and 

 Hedwigia aquatica. Fruitstalk terminal, about as long as 

 the stems ; capsule ovate, erect, having a slight apophysis 

 at the base, longitudinally striated. Lid rostrate. Peri- 

 stome, according to Mr. Templeton's remarks, double ; the 

 outer consisting of 16 short obtuse teeth approaching in 

 pairs, which at length become recurved; inner, of as many 

 alternating cilia lying horizontally over the mouth of the 

 capsule. 



Although this plant seems to be wholly unknown to the 

 Continental botanists, we possess specimens gathered in the 

 South of France and Italy ; and we have others, differing 

 from them only in being somewhat larger, which we have 

 received from the Isle of France. Schwaegrichen has united 

 this with Bryum androgynum, and formed of them the ge- 

 nus Gymnocephahts, from the naked male flowers which he 

 supposed this to possess, but which lie would not have done 

 had he known our plant. 



