208 



LICHEXACEI. 



[alf.ctoria. 



38. ALECTORIA Ach. Lich. Univ. (1810) p. 502 pro parte; 

 Xyl. Syn. p, 277. — Thallus filamentose, often intricately branched, 

 concolorous on both 

 sides, somewhat shi- 

 ning ; medullary layer 

 loosely arachnoid or 

 lacunose, not readily 

 separating from the 

 cortical layer, ■vrhich 

 is corneoiis. fonnerl of 

 subparaLlel filaments 

 closely conglutinate. 

 Apothecia discoloi'ous, 

 or rarely subconcolo- 

 rous with the thallus, 

 rarely with ciliate 

 margin; hypotheciura 

 colourless ; spores Snie 

 and small, or 2— Inae 

 and larger, very rarely 

 murali- divided, el- 

 lipsoid, sometimes 

 at lensth becoming 



Fig. 41. 

 Alecforia ochroleuca 2Cyl. — a. Vertical section of 

 a young apotbeciiiiii, x30. b. Theca and 

 parapbysis. X 350. c. Spores, X 500. d. 

 Longitudinal section of thallus with a sper- 

 mogoiie, X 30. e. Steriginata and spermatia, 

 X 500. 



brown ; hymenial gelatine bluish with iodine. Spermogones lateral, 

 inclosed in thalline tubercles, the conceptacles externally blackish ; 

 spermatia acicular, fusit'ormi-incrassate toAvards either apex. 



The species of this genus are characteristic of mountainous regions, and 

 several occur in g^reat abundance in suitable localities. In sorue tlie thallus 

 becomes at length free from the substratum, because of the decay and 

 death of the lower portion, which does not, however, prevent them from 

 freelv veffetatiua'. 



a. Apothecia lateral or pseudo-terminal ; spores 2-4nae, somewhat 

 large, colourless or at length brown. {Evalectoria Fr. fil. 

 Gen. Heterol. (1861) p. 48.) 



1. A. ochroleuca Xyl. Mem. Soc. Cherb. v. (1837) p. 98.— Thal- 

 lus csespitoso-fruticulose, rigid, erect, rounded or somewhat com- 

 pressed, smooth, or here and there lacunoso-impressed, much and 

 divaricately branched, ochroleucous or whitish straw-coloured ; 

 branches attenuate, the apices recurved and usually blackish 



(Kf ^•^^^°"^'^^\ CaC'l" ). Apothecia large, innato-sessile, at length re- 



pand, blight brownish-red or brownish-black, the margin inflexed 

 or excluded ; spores 0,028-42 mm. long, 0,014-24 mm. thick. — 

 Mudd, Man. p. 73 ; Cromh. Lich. Brit. p. 24 ; Leight. Lich. Fl. 

 p. 87, ed. 3, p. 79. — Corniciduria ochroleuca Hook. Fl. Scot. ii. 

 p. 69 ; Sm. Eug. Fl. v. p. 229. Lichen ochrolcuois Ehrh. Beytr. 

 iii. (1789) p. S2 : Dicks. Crypt, fasc. iii. p. 19 ; With. Arr. ed. 3,' iv. 

 p. 46 pro parte ; Eng. Bot. t. 2374.— /?/(7. /•;.<>■. : Crumb, n. 126. 



