1858.] THE ORTHOTRICHE^ OF YORKSHIRE. 575 



spores large ; calyptra very dark. Trees in woods. September. 

 Very common in Yorkshire^ often confounded with 0. crispum. 



20. 0. crispum, Hedw. Leaves crowded, all spreading and 

 crisped when dry, bright-green ; capsule yellowish, elliptic- 

 clavate, tapering into the stronger seta ; ribs broad, close ; con- 

 tracted below the mouth when dry ; cilia of two rows of cells ; 

 spores small; calyptra pale. Woods. July, August. 



Much less common than 0. Bruchii, from which it is known 

 by the narrower, green leaves, remarkably contorted when dry ; 

 areolae close, about half the size; capsule stronger, strami- 

 neous, and narrow, contracted below the mouth when dry ; ribs 

 as broad as the interspaces ; cilia short and strong. In 0. Bruchii 

 the capsule is deeper coloured, more ovate, contracted at (not 

 below) the mouth when dry, ribs half as broad as the interspaces, 

 cilia filiform, and spores larger. 



/8. crispulum {0. crispulum, Bry. Eur.). Smaller in all its 

 parts ; capsule short, oval-pyriform ; pedicel slender. Rare. Trees, 

 subalpine glens. July, August. Teesdale ; Forge Valley, Scar- 

 borough, Dr. Black ; Woodend ; Grithorp-gill, Boltby, Mr. Baker. 



Capsule short, oval, with more distant ribs, less tapering into 

 the pedicel. Leaves yellowish-green, areolse rather larger, with 

 strong papillse. In pale-coloured varieties of 0. crispum the 

 cellules are more distant, and larger than in dark-green ones. 



I have seen specimens with short capsules intermixed with 

 those of the ordinary form, and intermediate states are some- 

 times met with. 



0. crispulum is said by Schimper to ripen in May and June, 

 but our specimens are in good condition so late as August and 

 September; agreeing in that respect, as well as in the minute 

 structure of the peristome, spores, etc., with 0. crispum. The 

 capsules of both forms are empty, and contracted before those 

 of 0. Bruchii reach maturity. 



21. O. phyllanthum, B. and S. Leaves lanceolate, not dilated 

 at the base, nerve incrassated, bearing at the apex a tuft of 

 brown, stellate gemmse. Trees, especially near the sea. Barren. 

 Ingleby, Wharfdale, Scarborough, Clapham. 



Explanation of the Figures. 



The numbers attaclied to the figures indicate the extent to which they are mag- 

 nified ; thus, those marked 10, are magnified ten, and those 180, as many diameters. 

 S. 1. Stem-leaf. p. L. Perichsetial leaf. A. i. Apex of leaf, enlarged to show the 

 areolae, o. c. Old or empty capsule. VAG. Vaginula. OC. Ochrea. GEM. Gemmse. 

 6P. Spores. PEE. Peristome. 



