322 Mr. W. Mitten on the Mosses and Hcpaticce of Sussex. 



No precise locality is known for this moss, but one small tuft was 

 found amongst mosses collected by Mr. Jenner in the neighbourhood 

 of Hastings. 



Stems scarcely half an inch high, growing in dense tufts, the upper 

 portions dark green, the lower pale and covered with whitish rootlets ; 

 the leaves are patent, subspathulate or widely lanceolate, shortly acu- 

 minate carinate ; the nerve vanishes just below the apex ; the texture 

 of the leaves is composed of perfectly hexagonal cells in the upper 

 part, and in the lower part they are elongated and colourless ; the 

 perichsetial leaves are rather longer, but of the same shape as the 

 cauline : the setse are about a quarter of an inch long and yellowish ; 

 the capsules are erect pyriform-ovate, when dry ovate pyriform and 

 eight-striate ; the operculum conical subulate, oblique ; the external 

 peristome consists of eight bigeminate minutely rugose whitish teeth, 

 the internal of eight subulate colourless cilia, alternating with the 

 external teeth ; the calyptra resembles that of Z. viridissimus, and 

 covers about one-third of the capsule. 



Although the confusion has been very great respecting the present 

 species and Z. conoideus, still there seems no just reason why Dick- 

 son, who was the first to observe and describe these two mosses, 

 should have his names set aside because others have confounded 

 them and imposed names of their own. 



In Mr. Borrer's herbarium is preserved a small portion of an ori- 

 ginal specimen gathered by Mr. Forster on a felled tree at Chapel-end, 

 Walthamstow, and this being the source of Dickson's species places 

 beyond doubt the fact that his Bryum Forsteri, " capsulis erectis den- 

 ticulatis, setis adscendentibus surculis subacaulibus, foliis ovatis," is 

 the same as the Z. conoideus of Bridel and continental authors, who 

 have been altogether misled by the ' Muscologia Britannica.' This 

 moss is still in want of a precise locality, Mr. Forster' s specimens 

 being from a felled tree in a timber-yard, and Mr. Jenner' s gathered 

 somewhere near Hastings. 



Genus 9. Orthotrichum, Hedw. 



99. O. anomalum, Hedw. 



Not unfrequent on roofs and walls. 



100. O. diaphanum, Schrad. 



Common on trees and fences, rarely on roofs. 



101. O. stramineum, Hsch. 



Not very common, chiefly on beech-trees. 



102. O. rivulare, Turn. 



Rare : it occurs on bushes and roots by the stream at Little-ease 

 near Hurstpierpoint, and on posts at Shermanbury. Mr. Borrer has 

 found it at Henfield, and Mr. Jenner at Lugershall. 



103. O. Sprucei, Mont. 



Frequent on trees and fences by rivulets, always within the reach 

 of occasional inundations. 



