AMBLYSTEGIUM OCOMPACTUM IN BRITAIN 181 
distinctness in different leaves on the same stem. ‘There is some 
slight variation, too, in the width of the cells, and in the degree of 
acumination of the leaves. ok spite of these oe however, 
amount to much, and in those plants which have the cells mostly 
wider than in the type there are usually to be found stems on 
which the leaves have cells of about the ordinary dimensions. 
The extreme — of variation in the dimensions of ue big ode is 
i nto a filiform state, with th stems stolonifo O 
ex iretety minute, ill- -developed leaves, as in the var. falas e 
(var. cavernarum the Heterocladium. In this coriditian 
even in the most slender forms, stems can generally be gg bear- 
ing larger leaves more nearly approaching the norm 
d a synonymy, and a short description of the iain I 
aoa: Besieoanite, in a supplement to the third yolume of his British 
Oss 
oe hsceaionie (C.M.) Aust. Muse. App. 372 leageai ns * 
Syn.—Hypnum serpens var. compactum Hook. in Drumm. M 
Amer. ii. No. 188 (1828). 
AA. compactum C. M. Syn. Muse. Frond ii. p. 408 (1851). Sull. 
oe Muse. 201, tab. 1 (1864). Lesq. & James, Man. p. 875 
Me serratum B, & 8. Bry, Eur. Amblystegium, p. 11 (1858), in 
note 
Stereodon compactus Mitt. in Proc. Linn. Soc. os p. 43 (1864). 
A. densum Milde, Bot. Zeit. 1864, p. 21 (Bei 
Fihynchostegium teneliwn var. brevifolium Lindb. tab. Bryoth. Eur. 
No. 750 (1864). 
2 eryptarum Sauter in ge 
No. 8 eG hese. var. cryptarum (Santer) Arnold in Rab. Bryoth. Eur. 
rachythecium densum Juratz. in Rab. estore cua ae 995 
sa a Laubmoose Deutsehl. &e. iii. ae. ( a M. 
Hypnum densum Milde, B . p. 860 (186 te 
gyn. ie BSE e, Bryol. Siles. p. 360 ( 
A, sonpaihe Aust. 7.c. Macoun & Kindb. Cat. Canad. Pl. v 
p. 221 (1892). Cheney in Bot. Gaz. xxiv.p. 262 (1897). cane 
ae lil. p. 881 (1898), Héribaud, Museinées d’Auvergne 
sit ee ge 
* American plant is compactum Br. & Sch. I do 
not know what gave vise to this, but at appears to bea puro C70 
