LICHENS AND LICHEN. PARASITES

1t.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
Thallns small and probably immature, 3 X 1.5 cm., surface very faintly scrobiculate and
minutely short tomentose, sinoke gray to isabella colour or darker, margins strongly ascending,
shallowly sinuate, lobate aiid somewhat microphylline; below white, veins strongly elevated,
bearing short, conical tnfts of rhizinae, arachnoid between the veins; cortex 75p thick, pseudo-
parenchymatous from a palisade, cells nearly isodiametric above, up to 12p in diameter, more
elongate below, 1.5-17 X 74.4, thin-walled; some of the cells growing out to form the thin-walled
septate hyphae of the tomentum; algal layer 100-110p thick, filaments predominantly periclinal,
closely packed above, more scattered below, cells 5-6p, somewhat ellipsoidal; medulla about 75p
thick, thinning toward the margins, of somewhat periclinal hyphae, 6p in diameter with
moderately thick walls, loosely woven, hyphae of the veins 7-8p, parallel and conglutinate, grow- .
ing out in fascicles of rhizinae which finally blacken. Apothecia not seen.
Only two small thalli growing over mosses have been seen in the material from Macquarie
Jsland. Taylor in Hook. f. C Taylor, London Jour. Bot., 3, 650; 1844; Hook. f. & Taylor, Crypt.
Antarct., 85; 1845, reports P. polydactyla Ach. from Lord Auckland'd group, Campbell Island
and Icerguelen.
Macquarie Island : B.A.N.Z.A.R.E. 1658-2 ; Featherbed Flat, B.A.N.Z.A.R.E. 53%1.
Peldigera rufescens Wilson, M6m. Herb. ~oiss'ier, 18, 87; 1900 non (Weis) Humboldt.
Plants more or less erect anlong mosses in sandy soils, very fragile when dry, about 1-5 cm.
tall, lobes about 5 mm. broad, margins inrolled, surface smooth and shining, drying Verona brown,
underside tomentose without veins (as in P. malacea), light ochraceous salmon to light ochraceous
bnff; cortex 35p thick, of thick-walled pseudoparenchyma, cells 10-15p in diameter, apparently
from periclinal hyphae; algal layer 100-200p thick, of more or less confluent colonies of Nostoc;
medullary layer of thick-walled, densely tangled hyphae, 8-gP in diameter; lower cortex and
veins absent. Apothecitt not seen.
Kerguelen : Royal Sound, Robert Hall (3 collections in Nat. Herb. Melbourne Bot. Card.!
The following species have been reported from Kerguelen but no material of Peltigera was
collected by the B.A.N.Z.A.R. Expedition in this region. As species concepts were rather broad
and vague at the time these reports were made. and no characters of the Kerguelen plants were
recorded, the specimens need restudy before we can be certain of identities.
Peltigera (Peltidea) vemsa (L.) Baumg. doubtfully reported by Hook. f. & Taylor, London
Jour. Bot., 3, 650; 1844. Hook. f., Crypt. Antarct., 219; 1845 from Christmas ,Harbour, was
referred to P. spuria (Ach.) DC., [P. rufescens var. spuria (Ach.) Koerb.] by Crombie, Jour.
Rot. Brit. For., 15, 103; 1877. Rept. Sci. Itesults Voy. "Challenger" Bot. 1, 2, 233; 1885.
PeliirJera canina (L.) MTilld., reported by Hook. f. & Taylor, London Jour. Bot., 3, 650; 1844
from Christmas Harbour was omitted by Hook. f ., Crypt. Antarct. 1845.
Peltigera horizonidis (Huds.) Baumg., reported by Hook. f. & Taylor, London Jour. Bot.,
3, 650; 1844 : Crypt. Antarct., 219 ; 1845 from Christmas Harbour was referred to P. polydactyla
var. hymenn'na (Ach.) Fw. by Crombie, Jour. Bot. Brit. For., 15, 104; 1877.
Peltigera polydnctyla (Neck.) Hoffm., reported by Hook. f., Crypt. Antarct., 218 ; 1845 per-
haps a redetermination of the P. canina cited above was referred to var. hynaenina (Ach.) Fw.
by Crombie, Jour. Bot. Brit. For., 15, 104; 1877. Rept. Sci. Results Voy. "Challenger" Bot. 1,2,
234 ; 1885.