LECANIA| LECANORACEE 347 
13. L. prosechoidiza A. L. Sm.—Thallus thin, areolate, 
blackish-grey (K —,CaCl —). Apothecia small, the dise blackish 
or brownish-black, the thalline margin thin, disappearing ; 
paraphyses stoutish, unequal, rather cohering, septate, swollen 
at the tips and brown, with a dark-brown line over the top ; 
spores ellipsoid, 9-14 » long, 46 » thick, simple then faintly 
septate; hymenial gelatine blue then tawny with iodine.— 
Lecanora prosechoidiza Nyl. in Flora lxiv. p. 3 (1881) ; Cromb. 
in Journ. Bot. xxiii. p. 195 (1885) & Monogr. i. p. 427. 
Closely allied to L. prosechoides or to L. erysibe but with a much 
darker thallus and apothecia. The spores are so frequently simple 
that it might more truly be classified with Lecanora, but its affinity 
is with Lecania. Spermogones are rare with spermatia 16-22 u long, 
as) BK thick. 
Hab. On schistose and caleareous rocks in maritime districts.— 
Distr. Somewhat rare in W., N.E. and N. Scotland and E. Ireland. 
—B.M. Barcaldine, Argyll; Bay of Nigg, near the Cove and Portle- 
then, Kincardineshire; Forse, Caithness. 
14. L. erysibe Mudd Man. p. 141, t. 2, tig. 47 (1861) pro 
parte (incl. var. Rabenhorstii (non Hepp), excl. var. aipospila).— 
Thallus crustaceous, effuse, cracked-areolate or granulose, dull 
grey or greenish-olive or brown, sometimes very thin (K —). 
Apothecia rather small, innate, with a slight margin, becoming 
convex and immarginate, brown- or dull-red ; paraphyses coherent, 
stoutish, septate, slightly enlarged upwards and brown at the 
tips ; spores oblong-ellipsoid, becoming 1-septate, 10-15 p long 
(varely 19 »), 3-5 w thick; hymenial gelatine blue with iodine. 
Lichen erysibe Ach. Lich. Suec. Prodr. p. 50 (1798). Lecanora 
erysibe Nyl. in Mém. Soc. Sci. Nat. Cherb. v. p. 114 (1857) ; 
Cromb. Lich. Brit. p. 53 & Monogr. i. p. 443 ; Leight. Lich. Fl. 
p. 228; ed. 3, 218. L. phzoleucodes Nyl. in Flora lxii. p. 356 
(1879) ; Cromb. in Grevillea viii. p. 112 (1880) & Monogr. i. p. 445 
(incl. subsp. proteiformis Nyl. in Flora lxiy. p. 538 (1881) ?%). 
Ezxsiec. Johns. n. 371 (as Lecanora albariella) ; Mudd nos. 
104, 105. 
A very variable plant in the form of the thallus, which is mostly 
granulate-areolate, and in the apothecia, which become prominent 
and convex. Lecanora pheoleucodes has been included as not being 
specifically distinct. Crombie has inadvertently given its spermatia 
measurements (16-20 » long) for those of the spores; they measure 
only up to 15 » in length. A specimen in Johnson’s Exs. named 
L. albariella has also been included ; the spores are very long, up to 
19 », and occasionally an additional septum is formed in one of the 
cells. B. de Lesdain records several instances of equally long spores 
(Lich. Dunk. pp. 174 and 175), and I have agreed with him in including 
these long-spored specimens under L. erysibe, though possibly the 
differences are specific. A form with a thin finely areolate thallus 
growing on limestone has been described by Crombie as subsp. protez- 
Jormis. It is evidently a poorly developed condition of the species. 
Lecania proteiformis is synonymous with L. Rabenhorstii, and is 
