20 MUSCI. [Triciiostomum. 



4. T. microcarpon, Hedw. Leaves lanceolate, narrow above, 

 their margins recurved, their diaphanous summits subserrulate; 

 capsule ovate or elliptical ; teeth of the peristome rather short ; 

 lid rostrate. Hedw. Sp. Muse. t. 23, /. 8—12. Muse. Brit. ed. % 

 p. 107, t. 19. Trick, sudeticum Funck. Deutsch. Moos. t. 18, 

 No. 15. 



On rocks on the mountains ; not uncommon. 



/3. oblongum. Stems erect, tufted; leaves ovato-lanceolate, 

 entire ; capsule oblong ; teeth of the peristome divided to the 

 base. 



On Secawn mountain, near Dublin. Our (3 may turn out to be a dis- 

 tinct species. The stems are black, except at the very summits ; but little 

 branched ; setce on terminal shoots ; leaves without any diaphanous 

 points, quite entire, wider than in the common variety. The teeth of the 

 peristome are split down to their bases, whereas in the other not only is 

 the fissure terminated above the base, but the teeth are united below 

 around the mouth of the capsule. The Trich. microcarpon of Funcke 

 is a paler plant with diaphanous points to the leaves. 



5. T. aciculare, Beauvois. Leaves very broadly lanceolate, 

 very obtuse, serrulated, their nerve becoming broad and disap- 

 pearing below their summits, capsule oblong; lid rostrate. Pal. 

 Beauv. Prodr. p. 90. Muse. Brit. ed. 2, t. 19. 



On wet stones ; common. On limestone at Dunkerron it is of a pale 

 yellowish-green throughout ; on sandstone at Caiig mountain it is per- 

 fectly black all over, and the serrulations of the leaves no longer 

 visible. 



6. T. fasciculare, Schkader. Leaves lanceolate, entire, their 

 margins recurved ; capsule oblongo-ovate ; lid rostrate. Schrad. 

 Spic. Fl. Germ. p. 61. Muse. Brit. ed. 2, t. 19. Dillen. Muse. t. 

 47, /. 28. 



On mountain rocks ; not uncommon. Besides the plant of Dillenius 

 above quoted, with fascicled short branches, and of a dark dusky green, 

 a variety occurs on stones at Carig mountain, County of Kerry, of a 

 light tawny yellow, without any fascicled branches ; the peristome very 

 short, almost that of a Dicranum, the leaves more acuminated, their 

 points sometimes diaphanous : it will probably prove to be distinct. 



7. T. polyphyllum, Schwaegr. Stems tufted; leaves lan- 

 ceolato-subulate, serrated, their margins recurved, much crisped 

 when dry ; capsule oblong ; lid rostrate. Schivaeg. Supp. 1, t. 39. 

 Muse. Brit. ed. 2, t. 19. 



On rocks and walls ; common. 



8. T. ellipticum, Hook, and Taylor. Stems short, leaves 

 lanceolate, acuminated, straight, their nerve broad, their margins 

 plane, capsule elliptical ; lid rostrate. Muse. Brit. ed. 1, p. 63, 

 ed. 2, t. 19. 



On rocks at Fairhead, County Antrim. Near Bantry, Miss Hutchins. 



