L1GHENES. 11: > 



— var. dealbata Flag., Catalog. Lich. Algérie (1896), p. 53 ; Lecanora Schleicheri var. 

 dealbata Nyl. Prodr. Lichenogr. Gall. et Alger. (1857), p. 81, et apud Hue Lich. exot., 

 n. 1507 ; Parmelia dealbata Mont, et DR. Lich., in Bon de Saint-Vincent et Durieu de 

 Maisonneuve, Explorât, scient. Alger., Botan., l.S it», p. 248 ; Lecanora dealbata Nyl., 

 Enum. ge'nér. Lich., in Me'm. Soc. scienc. nat- Cherbourg, t. V, 1857, p. 113; Stizenb. 

 Lichenœa a fric, p. 129. 



Thallus in Balansa Plant. Alger., 1852, in Mus. paris., albus et clemiim plus minusve 

 rut'escens, crassus et squamulosus ; squamulee primum 0,4-1 mill. latae, rotundae, convexee et 

 discrets, dein 2-4,5 mill. metientes, contiguae, parum applanatee, in ambitu paulum crenu- 

 latee et in superficie valde punctato rugulosae ; subtus fusco rubricosae et terrée gomphi 

 ope adheerentes. Cortex superior 30-60 jj. latus, corpusculis atratis obnubilatus, passim 

 cuoi medulla hydrate kalico ferruginascensetsursum cristallorum oxalatis calcici glomerulis 

 hic et illic ornatus ; in eo hyphae fastigiatae, 3-4 \j. crassae, articulais articulis 4-7 a longis 

 cum lumine 2,5-3 y. lato et in sectionibus acidi nitrici ope mundatis, superne zona albida 

 12-20 a crassa, protoplasmate orbata, obtectee. Gonidia 10-14 a lata. lu medulla hyphae i-6 \j. 

 crassee, lumine 1 \x lato, interne ad gomphum efïbrmandum fasciculala 1 ; inter eas numerosi 

 cristalli. Apotbecîa 0,8-2 mill. lata, unicum vel rarius plura in singulis squamulis enata, 

 in eis primum immersa et dein paulum emersa atque disco atrato rut'o ornata. Caeterae nota' 

 sicut in forma genuina, sed parapbysuin iotegiimcnlum iodo eœrulescens. 



Varielas Algericc propria. 



In Pala'stina et in ^Egypto viget Lerricola hujus varietatis forma radicaux Nyl. Lich. .Egij-pt., 

 p. '.'), in Act. Soc. Linn. Bordeaux, t. XXV, quee apud Mùll. Arg., Lich. l'ulœstin., p. 2, in fier. 

 m ijco log., j an v. 1884, propria hahetur species, seu Placodiumradicans Mùll. Arg. 



489. Acarospora oxytona Mass., Ricer. Auton. Lich. croxlos. 1852), p. 28 ; Lecanora 

 oxgtona Ach. Lichenogr. univ. (1810), p. 436 et Synops. Lich., p. 183; Placodium oxg- 

 tonurn DC, in Lamark et DC. Flor. /'/■., t. Y, vel vol. VI (1815), p. 185; Parmelia chloro- 

 phana b. oxgtona El. Fr. Lichenogr. europ. re/'orm. (1831), p. 117; Lecanora chloro- 

 phana var. oxgtona Nyl. Lich. Scand. (1861), p. 173; Parmelia flava*. oxgtona Scheer. 

 Lich. helvet. Spicileg.,t. II,sect. 9, 1840, p. 420; Lecanora //ara a. oxgtonaSchxr. Enum. 

 critic. Lich. europ. (1850), p. 65; P/eopsidium /lavum liœrb.Syst. Lich.German. (1855), 

 p. 114. 



Exciccatum in herb. Mus. paris. : Parmelia /lava a. oxgtona Scheer. Lich. helvet. 

 ex si ce, n. 335. 



Thallus in hoc exsiccato viridi flavus, sat crassus, subnitidus, in centro lobulatus vel 

 verrucosus, in peripheria radiatus radiis 1-J,5 mill. latis, parum convexis et in apice appla- 

 natis crenatisque, saxo slricte adlurrenset in peripheria liber. Cortex 60-81) v. latus, superne, 

 latcraliter et etiam interne, in parlibits punctum vincturae excludentibus atque in zona cx- 

 terna corpusculis viridi tlavis, hydrate kalico flavo dissolutisrepletus; in eo hyphae fastigiatae, 

 verticales etobliqua',indistinclee,articulatee articulis saepesphaeroideis, passim oblongis, lumine 

 2,5-4 v. lato, in zona inferiore ramosee et meatus parvos praebentes atque in externa 20-40[x. 

 lata arcte coalita?, verticales et minus ramosa. ac raro zona ferc amorpha 6-10 \i. crassa obtectae; 

 in corticibus laterali et interne», 30 ;x crassis, hyphae valde ramosœ reteque formantes. Gonidia 

 pallide viridiae génère Algarum Cystococco Na i g. sumpta,6-12 a lata, membrana incrassata, 

 stralumque crassum sub cortice formantia; inter c'a hypha; 5-6 u. lalae, crebre articulatae cl 

 meatus aère plenos relinquentes. Hyphae mcdullares vel nudae, vel cristallos oxalatis calcici 

 admittenles, intricatae vel verticales et in basi horizontales, 4-8 o. crassae, articulâtes, 

 ramosœ et slricte implexae. Apothceia 1 mill. lata, in verrucissolitaria vel duo in unaquaque 

 enata, in centro pie rumque conforta et tum rotunda vel angulata aul oblonga, interdum acer- 



