GYROPHORA | GYROPHORACEE 389 
fructification were termed “ trice”’ by Acharius (Meth. Lich. p. xvii.), 
and after him by some British lichenologists. 
The species are classified in two sections :— 
Apothecial discs plane..................... i. AGYROPHORA. 
Apothecial discs gyrose ................06+ ii. EUGYROPHORA. 
$i. Acyropoora A. Zahlbr. in Engler & Prantl Pflanzenf. i. 
1*, p. 148 (1905).  Unmbilicaria subg. Agyrophora Nyl. in 
Flora Ixi. p. 247 (1878) ; Cromb. Monogr. i. p. 323. 
Apothecial discs plane ; spores simple, colourless. 
1. @. leiocarpa Steudel, Nomencl. Bot. p. 194 (1824).—Thallus 
moderate in size or rather large, monophyllous or deeply lobate- 
polyphyllous, rigid, the surface finely cracked- or wrinkled- 
areolate, brownish-black, or reddish-grey and sometimes pruinose 
towards the centre both above and below, generally smoother or 
more finely areolate below (K—, CaCl—). Apothecia rather 
small, prominent, stalked, plane, the margins thin, more or less 
irregular or crenulate; paraphyses coherent, the hymenium . 
brown ; spores oblong or elongate-oblong, 12-17 p long, 4-6 p 
thick.—G. atro-pruinosa Scher. in Meisner’s Naturwiss. Anz. i. 
p- 8 (1817). Unmbilicaria leiocarpa DC. FI. Fr. ii. p. 410 (1805). 
U. atro-pruinosa Scher. ex Ser. Mus. Helv. Hist. Nat. p. 109, 
pl. 12 (1821) pro parte; Cromb. in Journ. Bot. p. 273 (1882) & 
Monogr. i. p. 323. 
Often confused with Lichen anthracinus Wulf., a plant referred 
by Acharius (Syn. Lich. p. 63) to Gyrophora glabra. The spore 
descriptions are taken from Th. Fries (Lich, Scand. p. 166), as spores 
are wanting in all the specimens examined, though apothecia are 
cba ae these differ from those of other Gyrophore in the plane 
ise. 
Hab. On granitic boulders in exposed alpine situations.—Disir. 
Rare in the Grampians, Scotland.—B. M. Summit of Cairntoul, 
Braemar, Aberdeenshire. \ 
§ ii. Eucyropnora ‘A. Zahlbr, 1. c. Apothecial discs gyrose- 
plicate. 
The peculiar lines denoting alternate sterile and fertile tissue 
in the apothecium are due, according to Lindau (Schwendener, 
Bot. Untersuch. 1899, pp. 19-36), to the interrupted centrifugal 
development of the ascigerous tissue: a central area of paraphyses 
alone is first formed, then surrounded by a fertile ascus zone, and 
the alternation of sterile and fertile areas is repeated as growth 
proceeds in irregularly concentric lines. 
Thallus with few or no rhizine or fibrils. 
2. G. grisea Turn. & Borr. Lich. Brit. p. 236 (1859).— 
Thallus monophyllous, rather small (about 5 em. across), thin, 
