D, 



'uring the Gjøa Expedition under the command of Roald Amu.xdsex 

 (The North West Passage) also some Hchens were collected by the inde- 

 fatigeable Arctic explorer Hexrik Adolf Lind5trö>l Mr. Lixdström was 

 not a botanist, and the collection of lichens is not large. But every collec- 

 tion from this almost inaccessible part of the earth is of great interest. 



It contained a Lecidca n. sp. which I have taken great pleasure in 

 naming after Mr. Lixdström. 



The greatest part of the plants was collected at Gjoa Harbour and at 

 Herschel Island, a few also at King Point. 



For geographical particulars see Amu.ndsen, Roald: The North-West 

 Passage: Being the record of a voyage of exploration of the ship 'Gjøa' 

 1903—1907. London (Constable) I — II, 1908. 



Ale C tor i 11 Ach. 



divergens (Ach.) Xyl. Herschel Island, very abundant. Dark decum- 

 bent plants are easily mistaken for A. jitbata, but the positive medullary 

 reaction with CaCloOo is ver\' intense in A. diverge)is. 



jnbata (L.) Xyl. Gjøa Harbour, poor specimens. Better represented 

 from Herschel Island. 



nigricans (Ach.) Xyl. Gjoa Harbour, and Herschel Island. There are 

 relatively few specimens of this species which in Xorihern Xorway is much 

 more general than A. divergens, and the specimens are poorly developed. 



ochroleiica (Ehrh.) Xyl. Herschel Island, well developed. 



Bacidiü (De Xotrs.) A. Zahlbr. 



abbrcvians (Xyl.) Th. Fr. Herschel Island, on a dead Polylrichian. 

 Low hymenium (50//), short, three-septate spores (16 — i8.5X2-5.")- 



Blasteniu I Mass. 1 Th. Fr. 



fcrniginea \ar. cinnamomea Th. Yv.. Gjoa Harbour, several small 

 specimens. Concave or plane apothecia, and narrower spores than 

 B. leiicoraca [fcrniginea: 16 — 21 X 8 /H. 



