BRITISH LICHENS

JIIYCOPORUM MYCOPORACEl.E 381
and I-multi-pseudo-scptatc, 60-115 v- long, 1-2 v- thick.-Cromb.
in Journ. Bot. xiv. 363 (1876); Leight. Lich. Fl. ed. 3, 499.
Verrucaria myriospora Leight. in Trans. Linn. Soc. ser. 2, i. 145,
t. 22, figs. 1-3 (1876).
Exsicc. Larb. Lich. Rh. n. 60.
Distinguished by the smaller stromata and by the acicular, colourless
spores.
Hab. On holly.-B. M. Kylemore, Connemara, Galway (the only
locality).
Family XXXIV. MYCOPORACElE.
Thallus crustaceous not corticated, superficial or developed
within the bark (hypophlc£odal). Algal cells Palmella or Trentepohlta.
Perithecia compound, several united in a common outer
dark-coloured wall (peridiwn), but with separate ostioles; spores
6--8 in the ascus, variously septate, colourless or coloured.
A small Family represented in Great Britain by two genera ;­
Algal cells Palmella........................ 128. Mycoporum.
Algal cells Trentepohlia ............... 129. Mycoporellum.
128. MYCOPORUM Flot. ex Nyl. in Mem. Soc. Sci. Nat.
Cherb. iil. 186 (1855). (PI. 6l.)
Thallus thin or obsolete. Algal cells Palmella. Perithecia
compound with a dark-coloured outer wall (peridium) , the
different hymenia not distinctly separated; asci elongate or
pyriform-ellipsoid; paraphyses entangled or disappearing; spores
6--8 in the ascus, colourless or becoming dark-coloured, variously
septate or muriform.
The generic name Derma!ina Almq. m K. Svensk. Vet.-Akad.
Hand!. xvii. n. 6, 8, note (1880) has been substitutcd by Zahlbruckner
(Catal. Lich. Univ. i. 547 (1922». The established name lllycoporum
has been retamed here, on account of long usage and also of Its
association with llIycoporellum.
l. M. Quercus Muell. Arg. in Flora lxv. 402 (1882).-Thallus
very thin, indicated by a pale spot, or obsolete. Perithecia
2-{i-compound; the outer peridium small, black, nodulose with
the ostlOles of the enclosed perithecia; pcnthecial walls dark
below, indistinct laterally; paraphyses crushed, almost disappearmg;
asci broadly ellipsoid; spores 8 in the ascus, oblong,
3-5-septate with 1 or 2 longitudinal divisions, colourless, becoming
brOWnIsh, 15-18 v- long, 5--8 v- thick.-lIf. miserrimum Nyl. in
Mem. Soc. Sci. Nat. Cherb. v. 145 (1857); Carroll in Journ. Bot.
iii. 292 (1865); Cromb. Lich. Brit. 106; Leight. Lich. Fl. 406,
485; ed. 3, 438. A. L. Sm. Monogr. Lich. Part. ii. 349. Arthopyrenia
Quercus MassaI. Ric. Lich. 169, fig. 337 (1852). Dermatina
Quercus Zahlbr. tom Ctt. 551.
Exsicc. Mudd n. 231 (as Arthonia punctiformts).