140 GRIMMIACE^. 



This plant has not, so far as I am aware, been found outside Great Britain. The 

 fruit has only been detected in one locality ; frequently globose gemmae are found on the . 

 surface of the leaves. Limpricht considers it agemmiparous form of G. Miihlenbeckii ; 

 it has however a different aspect, and the basal areolation is distinct. By that and by 

 the decidedly squarrose-recurved comal leaves it may without much difficulty be 

 recognised. 



The Rev. C. H. Binstead informs me that it grows commonly about the shores of 

 several of the English Lakes, on rocks liable to be submerged ; in these situations the 

 hair-point is obscure, and the plant often larger. 



12. Grimmia Stirtoni Schp. (Tab. XXII. E.). 



In small dense blackish cushions, about \ inch high. Leaves 

 short, ovate-lanceolate, hardly narrowed at the insertion as in 

 G. trichophylla and G. Miihlenbeckii, erecto-patent, appressed 

 when dry ; margin slightly recurved below, thickened above, the 

 upper ending in a short, nearly entire hair ; areolation resembling 

 that of the last species, not sinuose, lax and shortly rectangular 

 at base, above small, rounded-quadrate, more or less incrassate, 

 in regular longitudinal rows. Dioicous. Fruit unknown. 



Hab. Basaltic rocks ; very rare. Near Glasgow (Stirton). New Galloway 

 ( ' McAndrew ). 



I have placed this species in the present section, although the fruit is unknown, 

 on account of its evident relationship to some of the foregoing species ; it is indeed 

 hardly separable from G. trichophylla, of which too, Limpricht considers it a form, 

 except by the areolation, which is wanting in the narrow-linear, sinuose basal cells of 

 that plant. Like G. subsquarrosa it appears to be confined to the British Isles. In 

 areolation it comes near G. montana, but that has plane margins, less thickened above, 

 and longer hairs. 



13. Grimmia decipiens Lindb. (Trichostomum decipiens 

 Schultz ; G. Schultzii Wils., Schp. Syn.) (Tab. XXII. F.). 



Robust, in lax tufts, i-if inches high, stems easily falling 

 apart ; yellowish or grey above, darker below, hoary with the 

 hair-points of the leaves. Leaves crowded, spreading, large, 

 from an oval-oblong broad base gradually narrowed to a lanceolate 

 point, i-i£ lines long, concave, carinate above, margin recurved, 

 nerve broad, strong ; hair-point long, sometimes almost equalling 

 the rest of the leaf, strongly spinosely denticulate , decurrent at 

 the margins of the leaf-apex. Cells at basal margins short, 

 rectangular, hyaline, in 4-6 rows, forming marginal bands distinct 

 throughout the leaf-base ; the median narrow-linear and elongate, 

 slightly sinuose, thin, yellowish, above becoming shorter and 

 more sinuose, very sinuose and rectangular in the rest of the 

 leaf, near summit sub-quadrate, regular, rather incrassate, in two 

 strata, rather large. Capsule oval-oblong, brown, strongly 

 striate, longer than in G. trichophylla ; lid rostrate ; calyptra 



