L I C H E N E S. 133 



Peltigera rufescens, Hoffoi. 1. c. p. 107 ; Fr. Lichenogr. p. 46 j Tuckerm. Lich. exs. 



n. 104. 

 Peltidea canina, var. crispa, Ach. Lich. Univ. p. 519 ; Syn. p. 239. 



Hab. Walls of the crater, East Maui, Sandwich Islands. 

 4. Peltigera polydactyla, {Neck.) Hoffm. 



Lichen polydactylus, Necker Meth. 85, cit. Ach. infra. 



Peltigera polydactyla, Hoffm. I. c. p. 106; Fr. Lichenogr. p. 46; Tuckerm. Lich. exs. 



n. 10. 

 Peltidea polydactyla, Ach. Lichenogr. p. 519; Syn. p 240. 



Hab. Fort Nesqually, Oregon. Hawaii, and Kaala Mountains, 

 Oahu, Sandwich Islands. Bay of Islands, New Zealand. 



Var. Fuegensis : thallo atroviridi lobulis angustatis subtus efibrilloso 

 tomentoso venis crassis reticulato ; apotheciis horizontal ibm nigra- 

 fuscis. (Tab. 1, fig. 5.) 



Hab. Orange Harbor, Fuegia. 



Thallus smallish, dark blackish-green, dividing into numerous 

 narrow lobules ; beneath without fibres, but delicately tomentose, and 

 with prominent darker veins ; the dark-fuscous apothecia transversely 

 oblong and horizontal. — Appearing in some respects intermediate be- 

 tween the variety ct, Fr., and p. scutata, Fr. There is but a single spe- 

 cimen; but the aspect of this is so peculiar, that I am unwilling to 

 pass it by without notice. The habit of the Lichen is well displayed 

 in Figure 1. The other drawings are by Mr. Sprague; — 2, shows a 

 lobe of the thallus, with an apothecium, slightly magnified ; 3, a por- 

 tion of the lobe and apothecium cut lengthwise ; 4, a smaller portion 

 of the apothecium, highly magnified, showing the filamentous medul- 

 lary layer appearing to pass into the denser cellular tissue of the hypo- 

 thecium, which is crowned by paraphyses, amongst which appear two 

 spore-sacks, containing imperfect spores ; and 5, a vertical section of 

 the same lobe, exhibiting the cortical layer passing into the medullary, 

 a few clusters of gonidial cells between these layers indicating the 

 discontinuous green stratum, while the medullary layer is seen to pass 



34 



