ï
Tribe X IV . S T I C T E I Nyl. Syn. i. (1860) p. 332, u t subtribus
Parmelieorum ; Bull. Soc. Linu. Normand, sér. 2, ii. (1867) p. 498.
Thallus frondosely dilated, lobate or lobato-laciniate, loosely
affixed to th e substratum ; th e under surface usually with tomentose
rhizinæ, and also pulverulent or sorediiform cyphellæ (pseudo-
cyphellæ), or tru e urceolate or thelotremoid cyphellæ; gonidial
la3’or consisting e ith e r of gonimic granules or of tru e gonidia.
Apothecia lecanoroid or parmeleine ; spores 8næ, fusiform, usually
I - or 3-soptate, gouerally colourless or sometimes pale-brownish ;
paraphyses discrete, usually more or less articulate, moderate, or
thiokish ; hymenial gelatine (especially tho apices of th e thecæ)
blue w ith iodine. Spermogones with jointed sterigmata.
Tlie plants of this tribe are for the most part the largest and best
developed of all lichens. With these “ patricians of lichens,” as they
were termed by Drs. Tavlor and Hooker (Hook. Journ. Bot. 1844, p 635)
the ascending series in Nylander’s classification culminates. The thallus,
which 111 Its earlier stages of growth isorbicular, is usually widely expanded’
of a coriaceo-memhranaeeous texture, aud frequently, rvhen wet, emits aij
odour as of hemp. In a few species peculiar cephalodia occur either ou
tlie ujraer surface, on the margins, or on the lower surface of the thallus
(mde Nyl. Syu. I. c. p. 333). Tlie great majority of species are found in
warm climates or in the Southern hemisphere ; most of the European
Fig. 46.
loharia pulmonaria Hoffm.-«. Vertical section of thallus, x200. b. Gonidia
X3o0. c. Vertical section of a small apotheciuin, x30. d. A theca and
paraphysis, X350. c. Three spores, x.500. /. Vertical section of a sperino-
gone, xdO. g. Jointed sterigmata and spermatia, x500.
Fig. 47.
Picasolia amplissima Leight.—a. Vertical section of a young apothecium, X30.
b. A theca and paraphysis, X3o0. o. Spores, xoOO. d. Vertical section of
a spermogone, x30. e. Jointed sterigmata and spermatia, X 500.
species occur in the more humid tracts of our islands. The tribe has
been divided by Nylander into the following 2 subtribes, comprising’
5 genera, founded upon differences iu the structure and character of tho
thallus, the presence or absence of cyphellæ, and the nature of the apothecia.
Subtribe I . S T IC T IN E I Nyl. Flora, 1879, p. 360.
Thallus e ith e r cyphellate or eoyphellate beneath ; gonidial layer
consisting of gonimia arranged in p luri-locular nodules. Apotheoia
lecanoroid, rarely parmeleine.
Distinguished by the nature of the gonidial layer, which separates it
as a very distinct subtribe. The plants are easily recognized by this
layer presenting under the lens, or even to the naked eye, a bluish or
leaden-bluish appearance.
44. STICTINA Nyl. Flora, 1860, p. 66, Syn. i. p. 333.—Thallus
variously lobate or laciniate, often sorediiferous ; beneath cyphellate
or pseudocj’phellate, w ith simple rhizinæ (rhizohyphoeNyl.) : gonimia
often 2 - 3 moniliform. Apotheoia usually w ith septate spores.
Spermogones innate, not prominent, with spermatia somowhat short,
obtusely and slightly thickened a t either apex.