DR. LINDSAY ON NEW-ZEALAND LICHENS. 541 
colourless, ‘0009’ long, *00045" to ‘0006’ broad, somewhat variable both as to size and 
form. The thecæ have the characters of those of Pertusaria, very large, ribbon-shaped, 
and distinct, 8-spored. The spores arranged in one or two rows, variable as to size and 
form, 0045" to 0075” long, "0009" to -0015" broad. No distinct paraphyses. 
In herbarium Kew : Sweden (Acharius, 1809). Spores (fig. 27) oval, but variable in 
form, sometimes subpyriform ; contained nuclei resemble vacuoles scooped out of solid 
spores; "0005" long, -0003" broad; thecæ 0035" long, ‘001’ broad. On rocks at Lyn 
Bodlyn, near Barmouth, Salwey ; spores :0006" long, ‘0003" broad. 
Sp. 10. L. PARELLA, Ach. 
On columnar basalt, Greenisland Bluff; on porphyritic basalt, the Forbury Head; 
on basaltie blocks, Signal-hill, North-east Valley, Dunedin; on slaty traps and trap- 
conglomerates, Ferry Bluff, Clutha ferry; on trappean cliffs, the Nuggets and Shaw's 
Bay, Otago: W. L. L. As variable as the British plant, from which it does not ap- 
parently differ, and as frequently sterile, and isidioid or sorediiferous. The latter forms 
are sometimes as abundant as in Britain, coating (especially basaltic or trappean) rocks 
to such an extent as materially to soften by their whiteness the blackness and bleakness 
of the stone, and so to become an important feature of the landscape. So frequently do 
crustaceous Lecanore, especially .L. parella and JL. glaucoma, whiten basaltie rocks, 
both at home and abroad, that they may to a great extent be regarded as diagnostie 
thereof. 
Corticolous forms of L. parella I found in abundance on the palings of the Zoological 
Garden at Botany Bay, New South Wales (fig. 28), having the ordinary characters, 
viz., spores (5, c) oblong-ellipsoid, simple, colourless, 0021” to -0024" long, 0009" broad ; 
thecæ (a) 8-spored, 0075” to 0090” long, :0024” broad ; paraphyses indistinct, very deli- 
cate, and filiform, without coloured or clavate heads; hymenium very pale blue or 
colourless under iodine. By ammoniacal maceration, on the small scale, it yielded 
when fresh, a port-wine or brownish-red colouring-matter, which gradually assumed a 
Beh crimson or purple hue on full aération or oxygenation. 
Foreign corticolous forms are apt to be confounded with 
owever, is easily distinguished on microscopical examination by its 
‘ent-shaped (curved), 3-septate, colourless spores. 
L. glaucoma, Ach., occasionally accompanies L. pare 
When looked for, it will probably be found to be a more 
on trappean rocks) of L. parella throughout New Zealand than is 
Dirina repanda, Fr., which, 
fusiform, cres- 
lla; it occurs on basalt on Saddle- 
frequent companion (also 
at present known. 
Sp. 11. L. SIMPLEX, Dav. (Fig. 29.) : 
= trachytie rocks, coast-cliffs, Anderson’s Bay, Dunedin, Otago: kei. 
= resembles Lecidea coarctata, Ach. ; apothecia minute, difform ; disk dark chest 
o margin subinvolute on the disk, and irregular in outline. DM. an dete 
1 herbarium Kew there are specimens from Rev. H. Davies imself : m j 
lesen, Apothecia (fig. 29) variable as to form, spherical to lirellseform alum dn e 
uently difform, sometimes confluent; colour wholly black, or disk sometimes of à 
VOL, xxv, 4 E 
