504 DR. LINDSAY ON NEW-ZEALAND LICHENS. 
tubereuliform heads, sometimes obscured by a considerable amount of brown granular 
colouring-matter, covered by a yellowish membrane (e). Hypothecium (e) brown. Apo- 
thecia, when old, frequently lose disk, partly or wholly, by erosion, exposing the hypo- 
thecium, and leaving flattish or subconvex shields of irregular form. Margins of thal- 
line lobes much and irregularly laciniose or subisidioid; general surface of thallus some- 
times also covered more or less with minute squamules, giving it a subfurfuraceous 
character. 
Sp. 6. S. RUBELLA, Hook. & Tayl. 
1. On trunks of dead trees, Greenisland bush, Otago: W. L. L.: sterile; one of the 
most beautiful New-Zealand species, distinguished by the brilliant or deep crimson red 
of the cortical layer, and the equally beautiful gamboge-yellow of the medullary tissue of 
the thallus. The latter is frequently exposed in erosion-patches of the cortical layer, and 
in the isidioid soredia, which are not uncommon. 
Sp. 7. S. AURATA, Ach. [Linds. Spermog. 200.] 
1. In my herbarium: New Zealand* : Dr. Hooker, Antarct. Exped.: sterile; errone- 
ously labelled S. erocata. Long. Island, North America: A. O. Brodie, No. 2135 (also 
sterile) : has a thallus of the colour of that of S. pulmonacea, from which tint to the rich 
crimson of S. rubella, the forms of S. aurata present every variation in shade. 
2. In herbarium Kew: Waiheke Island, N. Z. [Auckland Province]: Milne, H.M.S. 
* Herald," 1855: frequent on trunks of trees in the forests. Ngesi, Fiji: Milne, 
H.M.S. “Herald,” 1855: in fruit. Norfolk Island, 1855: common on trees in um 
woods, and also on the high grounds. Pacific Islands: thallus deep crimson, sterile. 
St. Helena : Dickson, 1804, and Mrs. Wilde: sterile. In Dickson’s specimens, the whole 
cortical tissue is eroded, the subjacent yellow medullary tissue being thus generally 
exposed ; well deserving, in this condition, its name awrata. In Mrs. Wilde’s specimens, 
decortication is nearly as extensive or general. Organ Mountains, Brazil (fig. 15). 
Spores normally and generally 1- (sometimes 3-) septate, ellipsoid, colourless " young 
state (a), becoming sometimes brown with age (b); -0008" to *0010" long, -0002” broad. 
Apothecia abundant, marginal; flat, large disk of a deep lake-colour, border ei 
foliaceous. Thallus brownish red, no yellow soredia, nor fissures of cortical layer. Peru: 
thalline margins generally abundantly sorediiferous, soredia of a beautiful saffron-yellow. 
This species is sometimes second in beauty only to S. rubella, but is seldom. fertile. 
In Europe its thallus is the site of a fungiform parasitie Celidium (C. Pelvetii, Hepp 
Exs. Nos. 372 and 589; Linds. “Observations on New Lichens and Fungi from 
N. Z.," Trans. Roy. Soc. Edinb. p. 450). 
Sp. 8. S. LAT-PRONS, Rich. (Fig. 16.) [Nyl. L. N. Z. 246; Bab. L. N. Z. 13.] Jd 
, 1 On trunks of dead trees, Saddle-hill bush ; on living trees, East Taeri bush: W. 
^ in " + set 
ke i = Jichen-collections of Dr. Hooker during the Antarctic Expedition of Sir James Ross in 1839 
ar as | am aware, made exclusively in the province of Auckland, North Island. 
