316 L'Abbe E. Coemans on the Cladoniae 



after Dr. Nylander, who has seen the authentic specimens of 

 Michaux. 



18. Cladonia haccilaris, (Ach.) Syn. p. 266 et hb. ejusd. 



The name Cladonia macilenta is now most generally used for 

 this species. 



Amongst the Acharian varieties, the first three {shjracella, 

 carcata, and monocarpa) ought, in my opinion, to be neglected, 

 as approaching too closely to the type. 



The var. clavata presents a modification more remarkable, and 

 may be retained. 



The var. coronata is, according to the Acharian specimens, 

 synonymous with C. polydactyla, Flk., as also another variety, 

 designated in his herbarium under the name of Cen. baccilaris 

 radiatceformis. 



I have not discovered amongst the Cladonia macilenta of the 

 herbarium at Helsingfors any specimen which is referable to 

 C. Florkeana. Acharius therefore never knew this latter plant. 



Dr. Nylander has already remarked the resemblance between 

 C. macilenta and digitata ; and I am myself inclined to unite 

 these two species, and to regard C. macilenta as only a variety 

 analogous to C. pyxidata cornuta and fibula. The Ardennes, in 

 Belgium, has, during the past year, furnished me with beautiful 

 transitional forms between these two types. 



19. Cladonia digitata (L.), (Ach.) Syn. p. 267 et hb. ejusd. 



Of the five forms or varieties of this species mentioned in the 

 Synopsis of Acharius, good examples are found in his herbarium, 

 but they only prove that nowhere is the distinction of varieties 

 less necessary than here. I therefore propose to erase the forms 

 brachytes, denticulata, cerucha, cephalotes, and monstrosa, 



A specimen of C deformis (from Sweden) is found intermixed 

 with C. digitata in the Acharian herbarium. This collection, 

 however, does not possess the intermediate forms passing into 

 C. macilenta ; but I have found them in the herbarium of the 

 Museum of Finland, in the herbarium of Florke, and in great 

 quantity on the rocks of the Ardennes. 



20. Cladonia deformis (L.), (Ach.) Syn. p. 268 et hb. ejusd. 



We may here also suppress the varieties crenulata, gonecha, 

 and pulvinata, proposed by Acharius. 



21. Cladonia coccifera, (Ach.) Syn. p. 269 et hb. ejusd. 

 Acharius is here more moderate in making varieties than his 

 rival Florke ; and for this he is deserving of praise. The only 

 two varieties which he makes do not, however, deserve to be 



