Grimmia.'] 



MUSCI-ACROCAUPI-PERISTOMI. 25 



dry, their margins recurved, those of the periclisetium with the 

 nerve running beyond their summits, capsule ovate sessile, lid 

 shortly rostrate. Turn. Muse. Hib. p. 23. t. 5. /. 2. Fl. Brit, 

 p. 1195. E. Bot. t. 1645. Drum. Muse. Scot. v.X.p. 25. Schxvaegr. 

 Sappl. v. 1. p. 95. t. 22. Muse. Brit. ed. 2. p. 66. t. 13.— G. al- 

 picola, £. Wahl. 



On rocks by the sea-shore. Fr. March.— Wahlenberg is surely not 

 correct in considering this as a var. of the preceding. It is very constant 

 to its characters. In both the teeth of the peristome are often 

 irregularly perforated. " Columella adherent to the lid and thickened 

 upwards." Wils. 



** Seta exserted, curved or genicidated. 



3. G. saxicola, Schwaegr. {sandstone Grimmia); stems scarcely 

 any, leaves linear-subulate crisped when dry, seta geni- 

 culated, capsule ovate, lid rostrate straight. Schwaegr. Suppl. 

 v.l.p. 82. t. 22. Muse. Brit. ed. 2. p. 67. t. 13. Hook, in E. Bot. 

 t. 2627. — Dicranum saxicola, Mohr — Campyloptts, Brid. 



On sandstone rocks, Blackdown, Sussex, rare ; Mr. Borrer. On 

 granite rocks in the Dublin mountains. Fr. May.— In size and general 

 appearance, this can hardly, by the naked eye, be distinguished from 

 Weissia trichodes, or from W. recurvata. The crisped leaves, with the 

 different nature of the peristome and mitriform calgplra, multifid at the 

 base, are, however, certain marks of distinction. 



4. G. pidvindta, Sm. (grey cushioned Grimmia); stems short 

 pulvinate, leaves narrow-elliptical their margins recurved, 

 their points diaphanous piliform, seta curved, capsule ovate 

 striated, lid conical acuminated. E. Bot. t. 1728. Drum. Muse. 

 Scot. v. 2. n. 26. — Dicranum pidviuatum, Sivartz. — Turn. 

 Muse. Hib. p. 78. Fl. Brit. p. 12 14. Schwaegr. Suppl. v. 1. 

 p. 189.— Fissidens pulvinalus, Hedw. Sp. PL t. 40.— Br yum 

 pulvinatum, Linn. — Dill. Muse. t. 50./. 65. 



On walls and rocks, frequent. Fr. Spring.— The teeth of the peri- 

 stome are generally perforated or deeply cleft, rarely entire : but the 

 plant ranks most unnaturally with Fissidens or Dicranum, where some 

 authors have placed i f . 



5. G. trichophylla, Grev. (hair-pointed Grimmia)} sterna 

 elongated Loosely tufted, leaves lax waved lanceolate gradually 

 tapering into a diaphanous point their margins recurved, 



Beta flexuOSe and curved, capsule elliptical-ovate silicate, lid 

 rostrate. Grev. Fl. Scot. Cr. t. 100, Drum Mute* Scot. r. 2. 

 ,,. 27. Mute. Brit ed. 2. p. 68, SvppL t. 2*— Dicranum puhir 

 natum, 3. Turn. Mux. Hib. p. 78. t. 3. f. I.? 



Discovered by Dr. Greville on stone walla at the fool of Arthur's 

 Scat, and since found in similar situations in many places, especially 

 the Highlands of Scotland. Near Dublin, Dr. Scoii and Dr.Stoiet. 

 N. Wales, Wilton. Fr. Apr.— With the teeth of a Qrimma for only 

 slightly perforated or split at the summit) this plant baa the foliage and 

 habit of TrichostomuMt 



