

4t 



Tandem periftoma deHtato-reticulatum duobus tantum generibus, nempe Fon* 

 tinali et Mtefiae competit; a quo caractere tamen MeeJIa longifeta (M triquetrum) 

 recedit, quandoquidem eius internum periftoma minime reticulatum eft, fed e pro- 

 ceffibus liberis per paria approximatis conftat. Hinc genus illud vitio laborat. 





Periftoma externum in plerisque muscis interius langitudine circiter aequat; 

 in nonnullis autem longe fuperat, ex: gr: in Neckera pennata (F), Neckera pumu 

 fib Contra in Meejia vliginofd (B trichodes), Buxbautnia aphylla interiore bre- 

 vius eft. 



Dentium forma, diuifio, color, fuperficies, longitudo fummopere diuerfae 

 funt, tam in periftomatibus fimplicibus, quam in compofitis. . Forma funt truncati, 

 in Buxbautnia aphylla \ obtufi in Meejia vliginofa y Mnio crudo; triangulares, in 

 Octoblepharo albido (B), Grimmia apocarpa(fi)\ pyramidales, in Tetraphide peU 

 lucida (M), Fontinali antipyretica; breuefacuti, in Mtiio fontano, Polytricho her- 

 cynico; longe acuminati, in Mnio caefpititio (B); cuneiformes, in Bartfamia Halle* 

 riana; acutiffimi, in Pohlia elongata; fubulati, in Lestia attenuata, Fontinali f qua- 

 fnofa ; lineares, in Didymodo rigidulo, Weiffia incuruirojlra] integri, in muscis pie- 

 risque; diuifi, in generibus aliquot fupra memoratis; femibifidi, in Die ranis Fiffl- 

 dentibusque fere omnibus; vltra medium bifidi, in Dicrano heteromallo V B); ad ba- 

 Cm vsque fiffi, in Trichojl otnis omnibus; aequaliter diuifi, in Dicrano fcopario (B); 

 inaequaliter partiti altera crure vel brfuiore, vt in Dicrano flagellars 9 Fiffidintc 

 adianthoide (HJ, vel anguftiore, vt in Dicrano heteromallo^ trifidi, quadrifidiin 

 Dicrano fpurio, Trichoflomo fontinaloide etc. 



Longitudo dentium fummopere diuerfa eft in diuerfis generibus 3ic fpeciebus. 

 Sic in Mniis, Hypnis, Trichoftomis etc. plerisque infigni longitudine oculis fefe 

 facillime fpeetandos praebent. Contra in Polytrichis omnium breuiffimi inueniun- 

 tur, et in Leerfia vulgari (B exftinctorium) adeo minuti funt, vt oculorum acumen 

 fere effugiant, vnde minus perfpicaces obferuatores huius periftoma nudum decla- 

 rauerunt. 



In pauciffimis fuperficies omnino laeuis reperitnr. In plerisque, fi tamen vi- 

 tro multum augente obferuantur, transuerfim lineata vel ftriata apparet; quin etin 



Grimmia cribrofa dentes fatis regulariter foraminibus multis pertufi funt J in Tri* 

 Tom. L F choflo- 





