A CONSPECTUS OF THE LICHEN GENUS STEREOCAULON ...

I. MACKENZIE LAMB: A Conspectus of Stereocaulon 283
Fregatte Novara, Bot. Theil, 1 (2): 124 (1870). - Stereocaulon ramulosum var. macrocarpoides (NYL.)
MULL. ARG. Bull. Herb. Boissier, 2, Append. I: 22 (1894).
Exsicc.: FOLLM. Lich. Exs. Sel. Mus. Hist. Nut. Casselensi Fasc. VII (1975) no. 137 (FH, KASSEL).
-Krypt. Exs. Vindob. Cent. XLIV (1963) no. 4339 (FH, LD, s). - V~ZDA, Lich. Sel. Exs. Fasc. XLVIII
(1973) no. 1191 (FH).
Icon.: RICH. 1832-33, P1. IX, fig. 4, as St. macrocarpum. - DUVIGN. 1956, fig. 10 A, as St. macrocarpum
(apothecial structure, asci, spores).
Remarks: phyllocladia absent or almost so in upper parts of pseudopodetia, there replaced
by a wrinkled and interrupted cortical layer. This character is however somewhat
inconstant, and some specimens seem to afford transitions to f. elegans and var. pulvinare.
The apothecia are often quite large, up to 4 or 5 mm dim., but sometimes reach this size also
in the two other taxa mentioned. Most typically developed in New Zealand and the subantarctic
islands, Tierra del Fuego and southern Chile, but material apparently referable
here has also been seen from New Caledonia. the New Hebrides, Tahiti, Bolivia, Venezuela
and Mexico.
Var. pulvinare (DODGE) LAMB (n. comb.)
ex D. C. LINDS. Brit. Antarct. Survey Sci. Repts. no. 89: 51 (1974) (comb. inval.).
Basionym: Sfereocaulon pulvinare DODGE, Repts. B. A. N. Z. Antarct. Research Exped. 1929-
1931, ser. B, 7: 139 (1948).
Typus: New Zealand, South Island, Dunedin, Mac's Valley, on rock, leg. J. S. THOMSON (date?)
(no. 9) (DODGE, holotypus).
Faculfative synonym (doubtful): Sfereocaulon macquariense DODGE, Nova Hedwigia, 15: 289
(1968) (see Append. 2, p. 323).
Remarks: pseudopodetia densely caespitose, crowded and intricated, forming hard and
rigid clumps very firmly rooted onto stones or gravelly soil. Perhaps a modification induced
by harsh environmental conditions, and possibly not taxonomically distinct from var. macrocarpum.
Seen from New Zealand and the subantarctic islands, Australia, Tasmania, southern
Chile, Tierra del Fuego, and South Georgia.
Fo. crebratum LAMB (n. f.)
Diagn.: Habitu maxime compcto et pulvinato, phyllocladiis coralloideis apicalibus
congestisque, superficiem crustesam efficientibus.
Typus: New Zealand, South Island, Port Chalmers near Dunedin, on rock, leg. J. S. THOMSON
(date ?) (no. D. 15, T. 696) (DSIR, holotypus; CAN, MO, isotypes).
Remarks: forming pulvinate tufts of extremely compact habitus, with the coralloid
phyllocladia apical and very crowded, forming a more or less crustose surface. Usually
sterile. Not uncommon in New Zealand and the subantarctic islands; also seen from Tasmania
and Juan Fernandez.
Var. pilophoroides (TUCK.) LAMB (n. comb.)
Basionym: Stereocaulonpilophoroides TUCK. Proc. Amer. Acad. Arts, 6: 265 (1864); DODGE, Ann.
Cryptog. Exot. 2 (2): 134 (1929); MAGN. in MAGN. et ZAHLBR. Ark. Bot. 31A (6): 47 (1944); LAMB ex
FREY, Bot. Jahrb. Syst. 86: 245 (1967).
Typus: U.S.A., Hawaii, without exact locality, leg. W. HILLEBRAND, 1864 (FH-TUCK, holotypus).
Facultative synonyms: Stereocaulon denudatum PERS. ex GAUDICHAUD in DE FREYCINET, Voyage
autour du Monde . . . executk sur les Corvettes de S. M. 1'Uranie et la Physicienne, pendant les annks
1817, 1818, 1819 et 1820, Botanique: 21 1 (1826) (non St. denudatum FLORKE ex anno 1819). - Stereo-