1 68 BERNT LYNGF.. M.-N. KI. 



also depicts tlic isidiac (I. c. tab. XV'I, c.) Most authors follow Aciiarics 

 in regarding them as proper species, e. g. Crombie, Harmand, and Malme 

 (Lieh. Suec. no. 64), Nylander and Th. Fries only consider them to be formae. 



Farm, scortca is distinguished by the presence of isidia, more coria- 

 ceous thallus and less appressed laciniae, and th( apothecia which are but 

 rarely developed. 



The isidia sometimes cover the whole central part of the thallus, in 

 other specimens they are but poorly developed, they may be reduced to 

 scattered dark capitulae, distinctly pedicellate or entirely sessile. They 

 occasionally fall of, leaving minute craters. If small and sessile, they are 

 very like black prominent pycnides, but a microscopical examination will 

 verify that they are isidial formations and not morbose hypertrophied pycnides. 



Parinclia tiliacca genuina, as represented in our herb, by Massal. Lieh. 

 Ital. 326, and by specimens from Switzerland (M. N. Blytt), and Hungary 

 (TiMKo), is not known from Norway. 



In and near Kristiania Parmelia scortea has suffered the fate of many 

 other lichens. Moe collected it in the botanical garden in 1869, and 1871, 

 and Kindt in 1876, Moe at Loenelv in 1871^ on Acer and other deciduous 

 trees, many of which still undoubtedly exist. But there is not the slightest 

 trace of Panii. scortea on them now. — Apothecia are very rare in Nor- 

 way, only a few fertile specimens being known. 



Pariii. scortea is a typical loivlaiid plant, but as usual with Norwegian 

 lichens its vertical distribution is but imperfectly known. It is restricted to 

 the lower part of the zone of the warmth-loving deciduous trees (Fraxi/ius, 

 Tilia, Acer). According to a herb, note by Moe it ascends to 450 feet 

 (150 m.) s. m. about Kristiania. If it does ascend higher, it is anyhow only 

 exceptionally. 



It is frequent in the Kristiania tjord provinces, but it is neither known 

 from our great valleys nor from the inland lowlands (the Mjesen district). 

 There is no reason to doubt of its existence along our south coast, for 

 it is known from several stations in Western Norway, especially on the 

 coast. It is rare in the western Cords (Havaas). — Not recorded north 

 of Dovre. 



The saxicolous f. borealis has a peculiar distribution along our west 

 coast from Stavanger to Lofoten, but as yet nothing can be said of its 

 frequency. 



34. Parmelia saxatiUs (L.I Ach. 



øst/. Hvaler (B. L.), Fredriksstad (Schub.). AkersJi. Holand: Skullerud 

 (B. L.), Aker very common (Moe, a. o.), Bærum: Kolsaas (Kler). Vest/. 

 Holmestrand (B. L.), Yasser (B. L.), Larvik (Norm.), Tjolling (HoegI, Malm- 

 øen (B. L.), Ula (Bassø), Stavern (Norm.). Busk. Nore: Borgaaen (Kiær). 



1 On the label designated as 'copiosior'. 



