DR. LINDSAY ON NEW-ZEALAND LICHENS. 543 
tudinal plications of both epi- and endospore are also visible frequently in old spores, 
prior to the elongation of the endospore and germination. 
Thecæ 1-spored, in tufts, very large, broadly ribbon-shaped, and beautiful (especially 
when blue under iodine), ‘012” long, ‘003° broad. Paraphyses indistinct, very deli- 
cate, filiform, without thickened or coloured heads. There are in lichens few hymenia 
more beautiful (especially under iodine), or more instructive for examination by the 
student, than that of the ubiquitous British P. commumis. 
Sp. 2. P. verara, Turn. (Fig. 2.) [Nyl. L. N. Z. 253.] 
On eolumnar basalt, Greenisland Bluff; on basaltie boulders, beach south of the same, 
Otago: W. L. L.: in fruit. The plant has a close general resemblance to Lecanora 
glaucoma, with which it may readily be confounded. Thallus very white, thick, and 
tessellated, made up apparently of a series of subangular isidiiform areolæ, which, in the 
old state, frequently fall away from their base of adhesion or support, producing ragged 
The apothecia are perched each on the apex of 
one of these cushion-like areolæ, and are, with the thallus, white-pruinose, frequently 
d disk of the lecanorine apothecium 18 
copiously so, by which the waxy flesh-coloure 
obscured and altered in appearance, as occurs in L. glaucoma, L. parella, and L. tar- 
larea. The plant is frequently sterile, and isidioid or sorediiferous like the Lecanoræ 
just mentioned ; and this sterile form is likely to be found abundant in Otago, and one 
source at least of that white coating of the coast-cliffs (of trappean rocks) as common 
there as in Britain. Probably it will prove, in this respect, to occupy the place in New 
Zealand of the white crustaceous Zecanoræ of Britain, compared with which it is, 
especially in fruit, quite as handsome a plant. Spores ellipsoid = ape en 
broadly mar&ined, endospore pale yellow, 0075” to 0090" long, ‘0030 to “0045 rit , 
frequently with one or more longitudinal plications, and occasionally with a yat ge? 
verse terminal ones, apparently of the epispore. Thecæ large, 1-spored, it an 7 d at 
with iodine, as is also the hymenial lichenine. Save the general transverse : iss 1 he 
the endospore in Otago forms of P. communis, the characters of spores and thec® 
Mio with thoss ‘tn’ P? waldda! As dn Bet fortis, the pho" neh 
epi- and endospore are best examined under a low power (half-inch object-glass, 
150 diameters linear). 
or irregular excavations of the thallus. 
Genus XXVI. THELOTREMA. (Plate LXITI.) 
Sp. 1. T. LEPADINUM, Ach. (Fig. 3.) 
On the bark of living trees, especially 
trees, living and dead, Greenisland bush; 
Coniferæ, East Taeri bush; on pede " 
on stock-yard palings atis tns I L 
bush, Chain-hills, Otago: W. L. L.: all in fruit; one of the most E enis 
crustaceous helps of the Greenisland district of Otago. gs de kie than its 
in its buff colour and mealy thallus, specimens from warm Ha a E much of 
British representatives. The sterile form of the €— — being, apparently, 
What would be called cortical Variolarie by the older lichenologists; 43 2 
