You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
166 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION<br />
[only 0.3-0.4 mm. in most recent collection], iiilrnersed, clisc plane or oiily slightly convex; parathecium<br />
scarcely more than a strand of hyphae such as separate the algal colollies, but appearing<br />
almost black in thick zections, pale fuscescent in thin sections, 9OP thiclr below the hypothecium<br />
thiniliilg to 5OP at the margin, of agglutinated, pericliilal hyphae; hypothecium hyaline, 55p<br />
thiclr, of vertical, deilsely woven hyphae; thecium 35 (-55)p tall; paraphyses slender, 2~ in<br />
diameter, wall gelified, sparingly dichotomoucly branched, tips only slightly clavate, bluish,<br />
imbedded in a stiff gel; asci cyliildric wheii young, beconliiig broadly clavate with thiclr walls,<br />
protoplast mamillate above 20-35 X 9-14r*; ascospores sub-biserate, hyaline, thin-walled,<br />
8-14 X &7p, ellipsoidal.<br />
[Spermogonia spherical, immersed, tip blaclr; wall diniidiate, fuliginous; spermatiophores<br />
snbfiliforin, 12-16r* long; spermatia cylindric or slightly smaller in the middle, tips rounded,<br />
6-8 X lr-Zahlbr.]<br />
This species has been very confused. Nylaiider separated the material so determined at Ke\v<br />
illto two species which he named Lecidea homaloteru Nyl. and L. diijunyuenda Nyl. Crombie<br />
later referred part of the material to L. st~bcontinzla. Nyl., citing Urceolaria endochlora Tayl.<br />
as a synonym, considering it a nomen ineptunt et infornte, basing his citation on the obconic black<br />
hypothecium which is conspicuous in that species. In the specimen in Taylor's herbari~un, thick<br />
sectioils of the apothecium under relatively low magnifications which were the highest available<br />
to Taylor, show his description to be remarkably accurate and characteristic of the species. Under<br />
these conditions, the bluish black epithecium shows the "disk consists of a black pruina", the<br />
rest of the very low thecium as "an exceedingly shallow lamina of a glaucous green colour, resting<br />
on an inverted cone of black matter, extending to the bottom of the thallus" (the brownish parathecium<br />
and included rock crystals of a thiclr section). Considering the optical equipment in<br />
use, Taylor's description is more accurate than those of Nylander and of Crombie. Since a careful<br />
reading of the joint work of Hooker and Taylor shows that Taylor studied the specimens and<br />
wrote the descriptions [the descriptions in Taylor's hand on the sheets in his herbarium are usually<br />
verbatim descriptions of those published] while Hooker merely saw the manuscript through press.<br />
After Taylor's death before the collections were fully studied, Churchill Eabington was called<br />
upon to study the undetermined material left at Kew and usually incorrectly identified it with<br />
previously described species. Hooker tried in vain to correlate the work of the two lichenologists<br />
without a careful study of the specimens, until it is very difficult to decide whether an opinioii in<br />
the "Cryptogamia Antarctica'' and the "Flora Antarctica'' is that of Babington, Hooker or even<br />
Taylor. In view of this situation, the specimen studied by Taylor and retained i11 his herbarium<br />
(especially as it is uniform) should be taken as the type rather than the miscellaneous duplicates<br />
( !) at Kew, which have been segregated by subsequent workers into three species.<br />
A careful comparison of Nylander's description of L. homalotera and of L. clisju~tieinda<br />
shows the only essential differences lie in the smaller apothecia and narrower spores. The type<br />
of 71. endochlora has some apothecia as large as the measurements given for L. dkjunyuenda, while<br />
the spores as measured by both Tuckerman and myself agree with the measurements give11 for<br />
L. homalotera. Zahlbruckner distinguishes Nylander's species on the length of the spermatia and<br />
spermatiophores (spermatia 16-2OP, spermatiophores 6-8~ in L. disjunyuenda; spermatia 6-8~<br />
spermatiophores 12-16p in L. hmdotera). A crushed preparation of the type of U. endochlora<br />
shows short spermatia only.<br />
On rocks with Verrucarirt ob fzucata, Microglaena kergzcelana, Porina JVert hG. Encepha!ographs,<br />
cerebn'nella, Lec&a intersita) Mykoblastus perustzis, Thulluidima kerguelensis, Rhkocarpon<br />
Johnstoni, R. kerguelense, R. Mawsomi, Pertusaria szcbperrintosa, Ltwanora atrocaesia, Blastenia
Change language