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DODGE-<strong><strong>LICHEN</strong>S</strong> <strong>AND</strong> <strong>LICHEN</strong> PARABITER 213<br />
Four plants from Kerguelen are rather more robust, the larger branches up to 1.7 mm. in<br />
diameter and often more foveate with correspondingly fewer verrucae and larger eroded soredia.<br />
In one section, an algal filament has pushed through a thin place in the cortex and is terminated by<br />
a subspherical sporangium, at the surface of the thallm. The sporangium had liberated all but<br />
two of the zoospores (or akinetes).<br />
As the epithet smediif er, if raised to specific rank in Usnea would be preoccupied by V. soredii-<br />
fera Am. in Lynge and by V. sorediifera (Hue) Mot., this entity would have to be renamed. It has<br />
seemed best to describe V. Crombii as new, based on our Heard Island plants as I have seen so few<br />
plants from ICerguelen.<br />
Growing with Usnea Taylori.<br />
Kerguelen : Rohl Sound, Robert Hall (Nat. Herb. Melbourne Rot. Gard.).<br />
Heard Island: between Atlas Cove and Corinthian Ray, B.A.N.Z.A.R.E. B140-35, B140-36,<br />
type, B140-37. I<br />
USNEA CROMBII, var. SUBLAEVIS Dodge, var. nov.<br />
? Netcropogon melaxanthus Crombie, Jour. Linn. Soc. Bot. 15,182; 1876. Jour. Bot. Brit. For. 15,<br />
103, 106; 1877 ; Phil. Trans. Roy. Soc. [London] 168 : 48. 1879 ; Rept. Sci. Results Voy.<br />
"Challenger" Bot., 1, 2,233; 1885; Schenck Wiss, Ergebn. Deutsche Tiefsee Exp. "Val-<br />
divia", 2, 1, 37 ; 1905 : Wilson, MBm. Herb. Boissier, 18, 87 ; 1900 non Ach.<br />
Type : Heard Island, between Atlas Cove and Corinthian Bay, B.A.N.Z.A.R.E. B14040.<br />
Thallus smoother, rather sparsely verrucose, scarcely sorediose, rather stouter and more<br />
branched below, upper branches more slender and tips acute, with occasional ramuli ; cortex and<br />
similar to that of the species, but the medulla disappears over large areas of the branches ;<br />
a\1$1: surface of the chondroid axis lacerate, with the algal filaments tending to penetrate the lacera-<br />
tions as in V. l'aylori; chondroid axis about 825p in diameter, not lacunose in the centre.<br />
While the structure of the stems remind one of that found in 6'. Taylori, the algal layer is<br />
better Yveloped and the habit is altogether different from that of the sterile specimens of U. Tay1or.i<br />
from Kerguelen.<br />
Heard Island : between Atlas Cove and Corinthian Ray, B.A.N.Z.A.R.E. B140-38, B140-39,<br />
B140-40. type.<br />
USNEA PROPAGULIFERA Dodge, sp. nov.<br />
,' Type: Heard Island, Atlas Cove to Corinthian Bay, B.A.N.Z.A.R.E. B140-52.<br />
4' Thallus erectus, ad 7 cm. altitudine, basi 1.5 mm. diametro, nigl-icanti, dichotome ramosus,<br />
internodis basalibus brevibus, ramis ca. 1 mm. diametro, fleuuosis, internodis mediis longis, superis<br />
brevioribus, ramulis sing~lis, apicibus acutis, frequenter nigricantibus, opacus, subprninosus,<br />
olivaceo-ochraceus vel dilutior, laevis, raro subrugoms vel subverrncosus; soralia orbicularia, marginibus<br />
subelevatis, suberosa, in ramis mediis confiuentia, in ramis ultimis magis elevata convexaque<br />
ubi soredia in ramillis (propagulis) ad 0.2 mm. longitudine, nigris evolvunt ; cortex ca. 20r. crassitudine,<br />
gelifactus, strato tenni crystallorum minu torum flavorum tectns, hyphis verticalibns pachydermeis<br />
ramosis; stratum algarum ca. 3Sp crassitudine, cellulis in filamentis dispositis, breviter<br />
cylindicis ad ar. diametro, cellulis solitariis subsphaericis, hyphis medullaribus circumdatis; medulla<br />
3545+ crassitudine, K- vel subbrunnescens, hyphis pachydermeis 4-5t~ diametro, deme antextis ;<br />
axis chondroideus ad 500p, teres, hyphis tenuibus, paehydermeis, ramosis, conglutinatis. Apothecia<br />
spermogoniaque non visa.<br />
Thallus erect, up to 7 cm. tall, base 1.5 mm. in, diameter, blackened, dichotomous, internodes
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