238 ORTHOTRICHACE.E. 



Hab. Trunks of trees, very rare. Epping Forest ; Sussex ; Somerset. Fr. 

 summer. 



A very pretty and interesting species, and no less rare than interesting. It has 

 very little resemblance to the other species of the genus, and is perhaps more like an 

 Orthotrichum, such as 0. pulchellum, though it is hardly likely to be passed over for 

 any other moss. The cells are twice as wide as those of any of the other species, and 

 of a very clear and regular texture. 



It is found on the continent, but never abundantly, and appears usually to con- 

 fine itself to a single tree in each of its localities, as has been found to be the case in 

 this country. 



6. Zygodon gracilis Wils. (Z. Nowellii Schp., Syn.) 

 (Tab. XXXIV. C). 



In wide deep patches, 1-3 inches high, repeatedly branched, 

 dull brownish green above, reddish brown below. Leaves spread- 

 ing and recurved, when dry incurved, very little twisted, oblong- 

 lanceolate, carinate, sub-undulate, slightly tapering to a sub-acute 

 point; margin plane, irregularly spinulose-dentate towards apex ; 

 nerve narrow, vanishing in or below apex ; areolation at base 

 narrowly rectangular, incrassate, shorter at margin and sub- 

 elliptic ; above very small, irregular, quadrate-rounded or 

 rounded-hexagonal, opaque, papillose. Seta short, reddish; 

 capsule oblong-cylindric, slightly inclined, 8-striate ; peristome 

 double, resembling that of Z. conoideus. Dioicous. 



Hab. Calcareous rocks and walls ; very rare. North of England ; Connemara, 

 Ireland. Fruit very rare, summer. 



A rare species, mostly confined to the carboniferous limestone of West Yorkshire, 

 and very different in habit from the other species, being a taller plant than most of 

 them, while of looser growth than Z. Mougeotii, and of quite a different colour. 

 Under the microscope it is at once known by its spinulose-dentate leaves. 



49. ULOTA Mohr. 

 (Weissia Ehrh., Braithw. Br. M. Fl.). 



Usually growing in small rounded cushions, on trees, more 

 rarely <5n rocks. Leaves lanceolate or linear-lanceolate from a 

 short ovate base, usually curled when dry ; median basal cells 

 very narrow-linear , incrassate , coloured, marginal wider, hyaline 

 in one or several rows. Capsule 8-striate, with a very long 

 tapering neck, exserted on a straight seta ; peristome single or 

 double, outer of 16 whitish teeth, usually united in pairs, and 

 more or less bifid, inner of 8 or 16 narrow processes, alternate 

 with the teeth, or wanting. Calyptra conical-campanulate, lobed 



