1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 87 



Physcia parvula WAINIO Lichenes Viburgenses. Meddel. Soc. Fauna et 

 Flora Fennica vol. II (1878) p. 52. OLIVIER Lichens d'Europe I (1907) p. 246. 



Physcia orbicularis d. sciastrella DALLA TORRE et SARNTHEIM Die Flech- 

 ten von Tirol etc. (1902) p. 167. 



Physcia sciastrella HARMAND Lichens de France (1909) p. 651, tab. 

 XVI, fig. 8. LETTAU Beitrage zur Lichenographie von Thuringen. Hed- 

 wigia vol. LII (1912) p. 255. 



Exsic. ARNOLD 583 (non vidi), LOJKA Lich. Univ. 223 (non vidi), 

 NORRL. et NYL. Herb. Lich. Fenn. 219. 



WAINIO collected the plant of NORRL. et NYL. 219, and NYLANDER has 

 recognized the determinations. On the label it is stated that Ph. parvula 

 WAIN, is a synonym of Ph. obscura f. sciastrella NYL. OLIVIER (1. c.) 

 enumerates them as two different species, but the above statement by the 

 two patres nominum must in this respect be decisive. 



The priority of the name must be based upon NYLANDER in ARNOLD 

 Lich. Exs. 583: -kParmelia obscura (HRH.) var. sciastrella NYL. The 

 names in Flora 1874 and 1877 are only Nomina nuda, without descrip- 

 tion. I have been unable to ascertain the exact date of publication of 

 ARNOLD 583; it was mentioned in Flora 1874 P- 5^9 anc ^ therefore most 

 probably appeared before 1874. (No. 446 was published in 1871, and No. 

 737 in 1879). In that case WAINIO'S name from 1878 is a later name. 



Thallus growing in small irregular patches i 1,5 cm. in 

 diam., but frequently confluent. Laciniae ascendant to erect, very 

 thin (7090 ,), loosely imbricate, short and very narrow (0,2 0,3 mm. 

 broad) with undulate or incise margin, either dilated at their apices like 

 a fan and profoundlydigitato-laciniate 

 or equally broad and profoundly lacerate \\t 



T ? I I >* ' ' 



orpinnato-incise. Laciniae atthemar- }L : 



gin instructed with pedicellate, fur- 



furaceous or rather elongate, bran- '""'%'' a*!, 



ched, coralliform isidia. If the cortex v : ^ .7 ^ >, 



of the isidia is broken off, medullary hyphae *^*/^x\sl / 



sometimes grow out forming pseudosoredia, .-> JrjEM'y' va ~.^> 



*t- J~ ^jti6 



genuine soredia not developed. Thallus f f il' \ 



opaque, colour varying from pale grey 



to greyish-brown or even brownish- Fig. 10. 



. . . Physcia sciastrella (Nyl.) Harm. 



black, when moistened with a strong tinge 

 of green. Lower side uncoloured. 



Upper cortex 15 25 /LI thick, surface unequal, insperse, more or less 

 opaque at the exterior part, otherwise uncoloured. Hyphae indistinct, 5 6 /t 

 thick, constrictedly septate with rounded articuli, occasionally less constricted. 



""^M 



