116 LICHENACEI. [STEREOCAULON. 
Tribe V. STEREOCAULEL Nyl. Mém. Soc. Cherb. iii. 
(1855) p. 170. 
Thallus cespitose, erect or decumbent, with solid fruticulose 
podetia, to which are affixed fragile, more or less evanescent gra- 
nules, usually bearing cephalodia, internally with chondroid axis. 
Apothecia lecideine, rarely lecanorine, terminal and lateral, para- 
physes discrete ; spores 8nz, sometimes 6ne, variously septate, very 
rarely solitary and murali-divided, subfusiform, cylindrical or oblong, 
colourless. Spermogones immersed, with simple sterigmata. 
Though resembling the Spherophorei in the fruticulose habit, this 
tribe is far separated by the granulose thallus and by the structure of the 
apothecia. om the preceding, to which it is closely allied, it differs in 
the absence of the thick subhymenial stratum. As observed by Nylander 
(Lapp. Or. p. 177), it precedes, like the Pilophoret, the Cladoniet, since 
the granulose thallus expresses a lower type in the series. 
29. STEREOQCAULON Schreb. Gen. P].(1791) p. 768; Nyl. Syn. 
i. (1860) p. 230.—Podetia branched, somewhat rounded, covered or 
sprinkled with gra- 
nules of various forms, ee, ian 
internally with a car- 7 
tilaginous axis formed f 
of longitudinal conglu- 
tinate chondrohyphe, 
to which are affixed r 
the external portions ¢ \ 
of the thallus, viz. a { 
corticali-gonidial and b 
an arachnoid medul- 
lary layer. Apothe- 
cia biatorine, blackish- 
brown or pale brown- 
ish, rarely lecanorine, 
black; hypothecium 
colourless ; spores Sn Fig. 33. 
or 6ne (in subclavate Stereocaulon coralloides Fr.—a. Vertical section of 
theca), fusiformi-cylin- an apothecium, X30. 6. Theca and paraphysis, 
drical, 3- or pluri-sep- 350. ¢. Spores, x500. d. Vertical section 
tate; paraphyses dis- of a young spermogone, x30. ¢. Sterigmata, 
tinct, slender or mode- 4's spermatia, x 500. 
rate; hymenial gelatine bluish with iodine. Spermogones lateral 
or subterminal in pale conceptacles, blackish at the apices, with 
spermatia aciculari-bacillar, straight, or longer and slightly curved. 
Many plants belonging to this genus have an elegant appearance with 
their fruticulose granulate podetia and numerous brown or tack apothecia. 
The podetia, especially in barren specimens, are sometimes whitish 
sorediato-capitate. The apothecia, which arise from the granules, are at 
first punctiformi-impressed, and then lecanoroid, becoming immediately 
lecideine (biatorine). Our British species, which belong to the subgenus 
Lustereocauon, have the thalline reactions K +yellow, CaCl=, except in 
‘. coralloides, where the chondroid axis is K+yellow. 
