A CONSPECTUS OF THE LICHEN GENUS STEREOCAULON ...

I. MACKENZIE LAMB: A Conspectus of Stereocaulon 235
28 (1926); FREY, Rabenhorsts Krypt.-F1.9, Abt. IV, I. Halfte: 200 (1932); DAHL et KROG, Macrolichens
of Denmark, Finland, Norway and Sweden: 136 (I 973). - Stereocaulonpaschale f. subcoralloides NYL.
Lichenes Scandinaviae : 64 (1 861).
Typus: no type specimen designated ("id inscripsi in Mus. Fenn."). No specimen labelled by
NYLANDER as St. paschale f. subcoralloides could be found by us in H (Finnish lichen herbarium and
general lichen herbarium) or H-NYL. Therefore it is necessary to select a neotype, and for this we have
chosen a specimen in H-NYL (no. 39994) from Finland, Korpilahti, leg. E. LANC (VAINIO) in 1874,
labelled by NYLANDER Stereocaulon subcoralloides (neotypif. nov.).
Exsicc.: Krypf. Exs. Vindob. Cent. XXI (1913) no. 2066 (FH, PR, S, WELC). - Lichenotheca Fenn.
Fasc. XXV (1949) no. 618 (UPS-MACN)?~ - NORRL. et NYL. Herb. Lich. Fenn. Fasc. I1 (1875) no. 85,
as St. coralloides (FH-TUCK). - RAS. Lich. Fenn. Exs. Fasc. I1 (1935) no. 56 (ups).
Icon. : DAHL et KROC 1973, fig. 45.
Mat. chim.: atranorin and lobaric acid (cfr. DUVIGNEAUD, 1942 and HUNECK, 1974).
Disfrib. : boreal circumpolar. Sweden, Norway, Finland, U. S. S. R. (Karelia ladogensis, Kola
Peninsula, Krasnoyarsk Territ., W. Siberia, Transbaikalia, Kamtchatka), Canada (Ontario, QuBbec,
Nova Scotia, Newfoundland), U. S. A. (New York, Maine, Alaska). Erroneous records: England
(MACNUSSON, 1926), Scotland (WATSON, 1942). The specimen from England mentioned by MACNUS-
SON (in EM, annotated by him as St. subcoralloides) is a small state of St. dactylophyllum FL~RKE. The
Scottish record of WATSON is based on a specimen of St. subdenudafurn HAV. (FH, commun. U. DUNCAN).
Remarks: closely related to St. sibiricum LAMB, less closely to St. tennesseense MAGN.
Rarely fertile. St. coralloides ,B. conglomeratum TH. FR. is given as a synonym of this species
by MAGNUSSON (1926) and ZAHLBRUCKNER (1926-27). However, TH. FRIES (1857, p. 17)
ascribes the epithet to E. FRIES, who had described it as St. paschale P. conglomeratum, which
is a nomen confusum (see p. 329). VAINIO (1940, p. 10) made the combination Stereocaulon
conglomeratum ("TH. FR.") VAIN. Both he and TH. FRIES used the epithet in the sense of the
present species, to which however it is inapplicable.
Fo. sorediascens LAMB (n. f.)
Diagn.: Phyllocladia passim soredioso-dissoluta, sorediis pulvinatis, albidis, farinosis,
0.5-1.5 mm latis, plus minusve confluentibus.
Typus: U. S. S. R., Karelia ladogensis, Kurkijoki, Kuupala, Jaavuori, leg. V. RASANEN, 1931
(CAN, holotypus).
Remarks: known only from the type specimen (sterile).
34. Stereocaulon supervestiens MAGN.
ex MAGN. et ZAHLBR. Ark. Bot. 31A (6): 37 (1944).
Typus: U. S. A., Hawaii, Oahu, Waianae Range, Kealea trail, leg. CRANWELL, SELLING and SKOT-
TSBERC, 1938 (no. 5640) (s, holotypus; CB, isotypus).
Zcon.: MAGN. et ZAHLBR. 1945, P1. VII, fig. 2.
Mat. chim. : atranorin and lobaric acid.
Distrib. : Hawaiian Islands.
Remarks: a somewhat unclear species of doubtful taxonomic position, known only from
4 collections. As it has some similarities to St. octomerellum MULL. ARG., it may actually
belong to sect. Denudata, subsect. Botryoideum. The extensive and persistent primary thallus,
with numerous dark cephalodia, somewhat resembles that of St. condensaturn HOFFM., but
the phyllocladia of which it is composed are smaller, regularly grain-like and equal-sized, not
27 Lichenotheca Fenn. no. 1230, as St. subcoralloides, is St. paschale (L.) HOFFM. (FH).