258 ORTHOTRICHACE^E. 



brown, oval-oblong, contracted into a short neck ; when dry 

 cylindrical, not or little contracted below the mouth, ribs 8, 

 rather narrow, stomata immersed, variously covered by the over- 

 lapping cells ; peristome double, orange-red, outer in 8 pairs, 

 reflexed when dry, finely papillose, processes 8, or 16, filiform. 

 Calyptra naked, yellowish below, brown at the point. Spores 

 rather large, about 25 /*. Autoicous. 



Var. /3. Winteri Braithw. (O. Winteri Schp.). Capsule more 

 exserted on a longer seta, rather longer and narrower ; peristome 

 paler. 



Hab. Trees, sometimes on walls ; not common. The var. £, Penzance 

 (Curnow) ; Bedfordshire (Saunders). Fr. early summer. 



One of the prettiest species of the genus, abundantly distinguished by the leaves 

 twisted when dry, the small exserted capsule and orange-red peristome. It has in 

 some respects rather the aspect of <* Ulota such as U. crispa var. crispula than of 

 an Orthotrichum ; but the coloured peristome alone would at once distinguish it. 



E. DIAPHANA. 



16. Orthotrichum diaphanum Schrad. (Tab. XXXVI. B.). 



In small dense cushions, about |-inch in height, greyish 

 green. Leaves erect when dry, elliptical-oblong or oblong- 

 lanceolate, acuminate ; with a rather long, hyaline, denticulate 

 hair-point which is wide at the base ; margin recurved to near 

 apex, nerve faint, narrow ; basal cells lax, rectangular, the upper 

 large, 15-20 p, irregularly rounded-hexagonal, thin-walled, 

 minutely papillose. Seta short, capsule emergent, ovate-oblong, 

 suddenly contracted into the seta, thin-walled , pale, with eight 

 very faint ribs each of two rows of scarcely incrassate cells ; 

 when dry more strongly striate, slightly contracted at the mouth. 

 Stomata immersed, numerous, partly closed. Calyptra not or 

 hardly hairy, yellowish green. Peristome double, outer of 16 

 pale slender teeth, spreading and somewhat recurved when dry, 

 but not reflexed on the wall of the capsule, processes 16, filiform, 

 papillose. Autoicous. 



Hab. Trunks of trees and wooden fences. Common. Fr. spring. 



Unique among our native species in the diaphanous points of the leaves. The 

 capsules are sometimes almost smooth without trace of ribs. The slender peristome 

 teeth, spreading in a stellate manner give the capsules a very pretty appearance. 



