NOTES ON THE PLANTS OF THE PORCUPINE MOUNTAINS AND 

 ISLE ROYALE, MICHIGAN. 



A. G. RUTHVEN. 



This list has been prepared from the collections and field notes of Mr. 

 N. F. Macduff, and the field notes of the writer. To Mr. Macduff, who 

 devoted his time to collecting and listing the plants, many of the determina- 

 tions and most of the annotations are due. The writer was able to add 

 many localities to the list while locating the different stations. We are 

 indebted to Dr. C. A. Davis and Mr. S. Alexander for the determination 

 of the Pteridophytes and Spermatophytes in the herbarium, and to Prof. 

 B. Fink for the determination of the Lichens. The nomenclature followed 

 is that given in Britton's "Manual of the Flora of the Northern States and 

 Canada," (1901). For the general habitat conditions and associations, 

 reference should be made to the discussion of the stations on pp. 22-40, 48- 

 52. 



1. PORCUPINE MOUNTAINS.* 



Lichens 



1. Amphiloma (Pannaria) languinosum (Ach.) Koerb. Found only in 

 shady places on the cliff face, III. 



2. Biatora lucida (Ach.) Fr. Associated with Amphiloma languinosum 

 on the cliff face, III. 



3. Cladonia alpestris (L.) Rabenh. Occurs in mats, covering the talus 

 blocks toward the bottom of the slopes where a slight soil has accumulated, 

 III. 



4. Cladonia rangiferina (L.) Hoffm. Abundant on the lower part of 

 the talus slopes with C. alpestris, also on ledges of the cliff that possess a 

 slight soil, III, and in the pine zone, III. 3. 



5. Endocarpum miniatum (L.) Sch. Covering the rocks in very damp 

 places on the banks of Carp creek, VI. 



6. Gyrophora (Umbilicaria} vellea (L.) Nyl. Only found on the cliff 

 face, III. 



7. Lecidea lactea Flk. This species is one of the pioneer forms on rock 

 habitats and was found associated with Parmelia conspersa and Lecanora 

 cinerea on the mountain top, cliff face and talus slopes, III; also on the 

 Middle Beach of Lake Superior, I. 



8. Lecanora conspersa. With Parmelia conspersa and Lecidea lactea on 

 ledges on the cliff, and on the talus slopes, III. Apparently a pioneer form 

 in rock habitats. 



9.' Lecanora cinerea (L.) Sommerf. A pioneer form in rock habitats, 



*A list of plants from the Porcupine Mountains was published by W. A. Burt in 1848. Jackson, 

 1st Sess. 31st Cong., Vol. 3, pp. 876-882. 



