1s KEY TO THE GENERA AND SPECIES OF BRITISH MOSSES, 
especially in_sporiferous a though not confined to ine 
s have a dist lining of their probably 
differentiated from the ae g tin of the vs pares ‘eell- idle. 
The spaces frequently contain yellowish granules (figs. 9, 12 
(d). The mode of attachment of the epiphyte to the « host”? plant. — 
The attachment of the epiphyte to Ascophyllum is ve tim 
Root-filaments given off from the base of the frond penetrate aeaty 
oO 8 
and medullary hyphe. The root-filaments have very thick cell- 
walls and central cells only, these being very much elongated. 
EXPLANATION OF PLATE 304, — Figs. Dee cae in the development of the 
als sverse section of 
&@ sporiferous branch, ahora a basal Sar (a) i in connection with three peri- 
central = (, b, by; ¢, central cell; d, ordinary pericentral cells (Zeiss, E.). 
7, Spo e act of ex g eres (Zeiss. E.). 8, A large 
central "cell, abowe ifferentiation of protoplasm (Zeiss y,). 9, A chain of 
space sis ). 10, Isolated “‘plugs” from young cells (Zeiss 
oat : 
central ). 
i, - “Plugs” (p) separatin g adjucent canals of two central cells, showing strie 
he canal-wall (ss’) (Zeiss 7, : a Lo: — ae through an old 
articulation 3 a, pericen ntral intere cell spaces; 6, pericen Pe c, central 
KEY TO THE GENERA AND SPECIES OF BRITISH 
MOSSES 
By rue Rey. H. G. Jameson. 
(Continued from p. 45.) 
KEY TO THE SPECIES. 
(N.B.—Only those genera which comprise more than one British species 
are included in this part of the Key.) 
ES nero pl. v. small and slender ...... ae 
— half-way or more. 3 
9 ico rai’ erecto-patent; dioicous ......... 
Caps. peat lid apicul.; Is. subsecund; monoicous.. confervoides 
3 ot ea usu. ceasing below upper 4 of leaf 
omg toeere up almost or quite to apex : 
? iP Xe =. > ls. ovate, usu. fobsomplen: ; cells narrow...... riparium 
v. slender; ls. ovate-lanc.; cells wi erpens 
5 a St. — ype seas base, acumin TUBEE ivencannnmunes 6 
ute points; ae "plladoek ooeee fluviatile 
(PC ate gE fixed by numerous radicles; Is. maproading nemianee radicale 
larger, st. sc. rooting; Is. m. or ]. secund..................... wriguum 
RIDIUM. 
uf (Le. curled when dry, basal cells thin-walled .................. lapponicw 
Ls. se. curled, basal cells incrassate ........+..... emeecuresns ie | eae 
ANDREZA, 
1 { Ls. nerveless ....... a 9 
Ls, singly nery 3 
