I916. Xo. 8. MONOGRAPH OF THE NORWEGIAN I'HYSCIACEAE. bg 



Pliyscia oôsaira et P/i. ulotlirix Crombie Brit. Lieh. I (1894) P- 3^8 

 et 319. 



Pliyscia orbicidaris Dalla Torre et Sarntheim Die Flechten von 

 Tirol ( 1902) p. 165. 



Pliyscia obsciira f. chloantha et var, cycloselis et var. ulotlirix Harmand 

 Lieh. France (19091 p. 643 et 646. 



Exsic. Anzi Lieh. Ital. sup. 124 [Pann. obscura var. chloantha (Ach. I. 

 127 {Pann. obscura f. ulothrix (Ach.I). Funck Crypt. Gew. 498 \Parm. 

 ulotlirix Ach.)). Hepp Flecht. Eur. 596 {Lobaria obscura a cloantha (Ach. II, 

 597 {L. obsc. £ cycloselis a corticola). Malme Lieh. Suec. 309 (Ph. ohscura 

 (Ehrh.) Nyl. var. ciliata (Hoffm.) Wain.). Schaerer Lieh. Helv. 353 p. p. 

 [Pann. obscura a chloauthä), 354 p. p. [Pann. obscura y orbicularis Sch.aer.). 

 Sommerfelt Plant. Crypt. Norv. 68 [Pann. cycloselis Ach.I. Stenhammar 

 Lieh. Suec. 211 [Pann. obscura Fr.|. Tlcker.man Lieh. Anier. Sept. 87 

 {Pann. obscura ß uiothrix Fr.). Zahlbruckner Krypt. E.xsic. \'indob. 577 

 {Ph. obscura var. chloantha Xyl.I. 



Thallus growing in small or middle-sized rosettes, diam. 4 — 5 cm., 

 appressed or closel}- appressed to the substratum. Laciniae di- 

 stinctly stellate, linear, equall}' broad, 0,5 — i mm. broad, 4 — 5, 

 rarely up to 10 mm. long, truncate or rounded at the apices, repeatedly — 

 usually divaricately — furcate or multihd. Laciniae discrete or oeca- 

 sionalh' with somewhat imbricate margins, plane or slightly convex with a 

 smooth surface, without soredia or isidia, opaque, epruinose, at the 

 margin with pale stellate cilia. Colour greyish-brown or dark- 

 brown. lower side black. A cushion of long, highly interlaced, tomentose, 

 usually unbranched rhizinae is seen between the discrete laciniae. 



Thallus covered with a thin amorphous, uncoloured stratum. Upper 

 cortex 25 — 45 (55) /( thick, at the exterior part yellowish or greyish-brown, 

 otherwise uncoloured. Hyphae regular, perpendicular to the surface, 

 constrictedly septate, almost moniliform. cell wall thin or moderately 

 incrassate. Gonidia glomerate, disposed in a somewhat incontinuous 

 stratum under the upper cortex, more rarely in the whole medulla. Me- 

 dulla white, lower cortex black, 25 — 40 // thick, rhizinae ca. 40 « thick. 



Nearly always fertile; apothecia appressed, crowded, orbicular 

 with diam. 1,5 2,5 mm., or angular, due to mutual pressure. Margin of 

 middle thickness, persistent, entire or crenate. Receptacle smooth or 

 rugulose, along the margin of the same colour as the thallus, otherwise black, 

 on the lower side and at the margin with black rhizinae. 



