DR. LINDSAY ON NEW-ZEALAND LICHENS. 501 
$p. 2. S. PHYSCIOSPORA, Nyl L.N.Z. (Fig. 6.) 
On the trunks of dead trees, Saddle-hill bush, Otago: W. L. L. 
Spores resemble in character those of the preceding species ; they are broadly ellipsoid, 
|-septate, in the young state frequently polari-bilocular (a), the loculi united by a central 
longitudinal canal; in the old state(c) the loculi breaking up into four (somet imes more) 
irregular granular masses, separated by imperfect interspaces ; brown, :0006" to *0009" 
long, 0003” to 00045” broad. Paraphyses subdiscrete, filiform, united at their apices, 
which are obscured by much brownish granular colouring-matter. Thecæ 0024” to 
0030” long, 0006” to :0009" broad. Hymenium blue with iodine. Spermatia rod- 
shaped, “00012” long, 00005” broad, seated on straight indistinct arthrosterigmata. 
All the essential characters of this species are those of the preceding, to which I do 
not hesitate to refer it as a mere form. The character on which Nylander apparently 
founds his species—the polari-bilocular or physcioid spores—is not a constant or distinctive 
one, inasmuch as, we have already seen, it occurs in various forms of S. fossulata ; and we 
shall hereafter find it occurs also in other Sticte. 
Sp. 3. S. oryemæa, Ach. (Fig. 7.) [Linds. Spermog. p. 199, plate x. figs. 23 & 24. | 
1. On dead trees, Saddle-hill bush ; on living trees, East Taeri bush, Otago: W. L. L. : 
abundantly in fruit and spermogoniferous, spermogones being, however, most numerous 
and best seen on specimens bearing few scattered apothecia. 
Spores ellipsoid or fusiform, colourless, 1- to 3-septate (in young apothecia 1-septate, 
this appearing to be the normal state of mature spores; in old apothecia 3-septate) ; 
‘0015” long, 0003” broad. Thecæ “0030” to -0036” long, "0006" to 0009" broad; with 
the hymenium generally, blue under iodine. Apothecia crowded centrally; many of them 
degenerate, the disk having fallen away, exposing the yellow medullary tissue of the 
thallus, which is also seen in various reticulated fissures of its cortical layer. Spermo- 
gones mostly peripheral on the thallus. "Thallus sometimes very handsome, 6 to 8 inches 
across, colour glaucous above, gamboge-yellow below. 
2. Chatham Islands: Dr. Müller, Melbourne: in my herbarium ; apothecia and sper- 
Mogones abundant. (Fig. 8. : 
‘Spores, in the M nié vary from colourless to brown. Thecæ 0080 ar. 
08” broad. Hymenium very beautiful when seen in section = under ae ssl 
“actly as in S. subcoriacea (Nyl. L. N. Z. 247; Linds. Obs. N. 2. rium a. 
P: 420, plate xxix. figs. 34-36]. Spermogones occur on the PPT the Mes un 
‘ough they are most conspicuous on those outside the region occupied by n Wan ke 
and about the periphery of the thallus. Spermatia in myriads, 00015 : - à icit" 
10005" broad; on delicate indistinct arthrosterigmata 00097 to rm 2 ER 
- The thallus is frequently stained in patches a beaut : er ial Las 
noticed also in various alpine lichens, such as Platysma oiov Tai; ea nokia pro- 
‘lemon-yellow thallus. T attribute this coloration to the action of zu a vient 
cred the decay of the droppings of birds on the colorific princip 
: . in my herbarium. gum and 
% Auckland Islands: Dr. Hooker, Antaret. Exped. Z 
VoL, xxy, | 
