40 PTEROGONIUM. 



7. Gr. Donniana ; stems short ; leaves lanceolate -subulate, pro- 

 duced into long, diaphanous, hair-like points, their margins 

 incurved; capsule ovate, teeth of the peristome quite entire; 

 lid shortly rostrate. (TAB. XIII.) 



Gr. Donniana. Engl. Dot. t. 1259. Gr. sudetica. Schwaegr. Suppl. 

 *.24? 



HAB. On rocks in mountainous districts. 



It must be confessed that the present species is so nearljr 

 allied to the preceding, that if great importance were not 

 always attached to the pevistomes of mosses we should have 

 found it impossible to distinguish them. Gr. Donniana is a 

 very much smaller plant, and the leaves are of a brighter, 

 though still a dark green colour, larger in proportion to the 

 fruitstalk, which thus seems half immersed. The teeth of the 

 peristome we have never been able to find either perforated 

 or split, on which account we quote hesitatingly the Gr. su- 

 detica of Schwaegrichen, which agrees well with our plant 

 in other respects. The lid we may observe is rather shorter 

 and more obtuse than in Gr. ovata, but on this much re.- 

 liance cannot be placed. 



16. PTEROGONIUM. 



GEN. CHAR. Fruitstalks lateral ; Peristome single, of 

 16 entire, equidistant teeth ; Calyptra dimidiate. 

 (TAB. II.) 



Mohr has, we think, contrary to nature, united this genus with 

 Weissia and Grimmia, from which its lateral fruit and altogether 

 hypniform habit will always keep it distinct. 



Pi. Smithii , stems much branched, branches pinnate ; leaves. 

 Ungulate, obtuse, entire, crisped when dry, their margins 

 recurved, nerve reaching above half way up ; fruitstalks very 

 short; lid rostrate. (TAB. XIV.) 



Pt. Smithii. Swartz inSchrad.Journ.v.2.p. 173. EnglBot.t. 1326. 

 Hypnum Smithii. Dicks. Crypt, fasc. 2. t. 5.f. 4. Hedw. Sp. Muse. t. 6. 

 HAB. Trunks of trees in the southern parts of England; 

 abundant in Devonshire. 



