LICHENS AND LICHEN. PARASITES

DODGE-LICHENS AND LICHEN PARASITES 167
keroplasta v. athallina, Buelliu subplicutu aiid ti. tristizcscula. Overgrown or partly parasitized
by L w ~ superjecta. m
Crozet Archipelago : Possession Island, American Bay, B.A.N.Z.A.R.E. B20-2, B20-4.
Kerguelen: Christmas Harbour, J. D. Hoolrer, type (Voy. "Erebns & Terror") in Taylor
Herb. ; Royal Sound, B.A.N.Z.A.R.E. B90-15, B90-16 ; Greenland Harbour, B.A.N.Z.A.R.E.
B177-37, B17743, B177-54, B204; Observatory Bay, B.A.N.Z.A.R.E. B192-2, B192-4, B192-29,
B192-36.
Heard Island : Between Atlas Cove and Co2inthian Bay, B.A.N.Z.A.R.E. B140-9.
ASPICILIA DISJUNGUENDA (Nyl.) Dodge, comb. nov.
Lecidea disjunguendu Nyl. in Crombie, Jour. Bot. Brit. For., 15, 105; 1877 ; Phil. Trans. Roy. Soc.
[London], 168, 51 ; 1879; Rept. Sci. Results Voy. "Challenger" Bot., 1, 2, 238; 1885 : Zahlbr.,
Deutsche Siidpolar Exp., 8,39 ; 1906.
Type : Kerguelen, Christmas Harbour, J. D. Hooker (Voy. "Erebns & Terror") at Kew,
detemined originally as Urceolaria endochlora Hook. f. & Tayl., but not type of that species.
Thallus thin, rimulose, determinate, margin thin, smooth, blackened ; surface smooth, glauconsgrey,
at least 375p thick; cortex 75r thick, a palisade of vertical hyphae 2-3p in diameter, the
upper 15p gelified and structureless; algal layer about 300p thick, protococcoid of clavate colonies
between vertical strands of medullar hyphae. cells 8-12p in diameter. Apothecia innate,
0.6-0.7 mm. in diameter, disc black, concave to plane; amphithecimn not differentiated from the
thallus; parathecium 350:~ thick below, thinning to the margin, of closely septate large, thickwalled,
yellowish brown hyphae, not carbonaceous, appearizlg almost pseudoparenchymato~~s,
extending vertically to the bottom of the thallus; hypothecium conical, the lower portion of
densely woven, deeply staining hyphae, becoming vertical above and merging into the thecium;
thecium about 90r tall ; paraphyses free, 34p in diameter, with thick gelified walls, closely septate,
tips capitate, dark brown, forming a thin, dark brown epithecium; asci cyliildric clavate with
thickened tip, protoplast truncate or mamillate, 8-spored; ascospores subdistichous, ellipsoidal,
hyaline 8-12 X 5-6p [ll-13 X 7-9p fide Nylander]. [Spermogonia spherical, irninersed, tip black,
slightly prominent ; wall dimidiate, black ; spermatiophores, narrowly ampullaceous, 7-8p ;
spermatia filiform more or less arcuate or hamate, 16-20 X lp-Zahlbruckner.]
This species seems intermediate between Lecawa atrocaesia and Aspicilia endochlora, and
it is with hesitation we have referred material as we have failed to find spermatia in this group.
The spermatial characters seem best for separation of these species. After an examinatioil of
over 60 slides from different collections, I have attempted to separate them as given in the key.
The extremes are easily separable with the naked eye, but there are many intergrading forms. The
character of the lips of paraphyses seems fairly constant.
Growing on rocks with Microglum. kerguelana, Encephalogrqha cerehrinella., Lecidea
assentiens, L. intersita, L. phaeostoma, L. rhizocarpiza, L. swbdisjunguenda? L. subplana, Toninia
kergwlensis, Rhizocarpon kerg-uelense, R. Mawsoni, Pertusaria swbperrimosa, Lecamora atrocaesia,
Buellia subplicsta, B. tristiuscda and RinosEina mpkilim.
Kerguelen : Royal Sound, B.A.N.Z.A.R.E. B90-7, B90-8, B90-9, B90-17, B126-9, B126-14;
Murray Island, B.A.N.Z.A.R.E. B246-7, B530-2 ; Observatory Bay, B.A.N.Z.A.R.E. B192-11.
B192-21, B192-32, B192-37 ; Greeiiland Harbour, B.A.N.Z.A.R.E. B177-31, B177-33.
Heard Island : Between Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. B140-6, B140-17,
B140-19, B140-25, B140-28.