ZYGODON. 235 



1. Zygodon lapponicus B. & S. (Gymnostomum lapponicum 



Hedw. ; Ancectangium la pponicum Hedw., Braithw. Br. M. Fl. ; 



Amphoridium lapponicum Scrip., Syn.) (Tab. XXXIII. F.). 



Densely tufted, dark olive green, blackish below, f-2 inches 

 high. Leaves spreading, flexuose, when dry curled and contorted , 

 oblong-lanceolate or linear-lanceolate, resembling those of 

 Ancectangium compactum, but less papillose, and with slightly 

 larger, rather more distinct areolation, the basal cells larger, 

 thin-walled , more pellucid, or frequently hyaline, margin plane. 

 Capsule on a very short seta, raised above or almost above the 

 perichastial bracts, oval with a distinct neck, when dry contracted 

 below the mouth and urceolate, strongly 8-striate, reddish above, 

 paler below, with a deep red, thickened rim ; gymnostomous. 

 Lid red, shining, with an oblique rostellate beak. Calyptra 

 small, cucullate, brownish. Autoicous. 



Hab. Clefts of rocks on mountains ; not uncommon. Fr. summer. 



When, as usually happens, the fruit is present in abundance, the striate, urceolate 

 capsules, hardly emergent above the perichstial bracts, cause the plant to be easily 

 recognised. Even without fruit the small dense tufts of a dingy green, with the 

 leaves strongly curled when dry, have a facies of their own not resembled by many 

 mosses. 



2. Zygodon Mougeotii B. & S. (Gymnostomum Mougeotii 



Bruch ; Ancectangium Mougeotii Lindb., Braithw. Br. M. Fl. ; 



Amphoridium Mougeotii Schp., Syn.) (Tab. XXXIII. G.). 



In large dense yellowish tufts, 1-3 inches high, brown below, 

 or rarely blackish. Leaves erecto-patent or spreading, crisped 

 when dry, longly linear-lanceolate , tapering to an acute point, 

 carinate ; margin entire or slightly irregular towards apex, hardly 

 denticulate, narrowly revolute below ; cells shortly rectangular 

 at base, above shorter, subquadrate-rounded or very shortly 

 rectangular, all incrassate, pellucid, and hardly papillose. 

 Nerve rather strong, vanishing at apex. Capsule very shortly 

 exserted, rather narrower than in the last, lid with a longer beak. 

 Peristome none. Dioicous. 



Hab. Damp rocks, frequent in alpine and sub-alpine districts ; fruit extremely 

 rare, ripened in autumn. 



This species is not likely to be confounded with any of the other species of the 

 genus, on account of its much longer, narrower leaves. It is much more like Weisia. 

 rupestris or W. curvirostris ; it has however longer leaves than either, and is almost 

 always of a more decided yellowish tint ; and the areolation differs widely from that 

 of the former. The fruit has hardly been found in half a dozen British localities. 



