The Scottish Naturalist. 75 



Cephalodia, of an orange-yellow colour, are somewhat abundant, 

 pitted and rogose, containing gonidia of a smaller size than in the 

 other parts of the lichen, and with scarcely any granular contents. 

 Chlorea rigidula sp. nov. — Thallus pallide lutescens vel albido- 

 cinerascens elongatus, nonnihil angulosus prsesertim infra et 

 axillis compressus, ramosissimus, apicibus. attenuatis et ple- 

 rumque fibrilloso-contextis. Axis crassus vel crassiusculus, 

 pallidus vel saepe et prresertim infra pallide rufescens, solidus, 

 fibrillse medullares compactae albce, K naventes dein rubentes 

 vel rufo-ferruginean, J — . In montibus Nielgherrensibus (D re 

 G. Watt) et in Canada ad Lacum Superiorem (Roy). 

 The Indian specimens are much more robust than those from 

 Canada, and. attain, at times, a foot in length ; the axis is also 

 thicker and denser, otherwise there is scarcely any other difference 

 of sufficient importance to warrant a separation. 

 Usnea maculosa sp. nov. — Thallus cinereus vel luride cinereus, 

 erectus compactus, rigidus, ramosus, subangulosus, lacunoso- 

 impressus, creberriter nigro-maculatus. Axis solidus, medio- 

 cris ; fibrillar medullares compactae albidae, K — C — ; J — . 

 In Chili a cl. J. King lecta. ' 



The axis in this lichen is compact, almost corneous, but scarcely 

 so well defined and distinct from the medullary fibres as in others 

 of the genus. In the absence of fructification, I cannot, however, 

 dissociate it from the members of the genus, nor can I refer it 

 to any other order, although it presents several characters common 

 to Ramalina ceruchis. The presence of an axis is a barrier, &c. 

 Usnca himantodes sp. nov. — Similis U. lougissimce sed truncis et 

 ramis primariis lsevigatis, teretibus sed hinc inde articulatis et 

 longius parciusque fibrillosis. Thallus pallidus vel pallide 

 cinerascens firmior, rigidior, pendulus, elongatus (pedalis, in- 

 terdum ultra). Axis crassus (ut in U. longissima\ fuscescens, 

 J — ; fibrillar medullares parcae, condensate, J caerulescentes, 

 K flaventes. 

 Corticola in New South Wales Australian (Kirkton). 



A very characteristic lichen. The reactions by Jodine differ 



entirely from those by the same reagent on U. longissima, inasmuch 



as the axis is not affected, while the medullary fibres (which are 



scanty) are rendered by it an intense blue then violascent. 



Usnea undulata sp. nov. — Thallus pallescens vel ochroleuco-pallidus 



undulatus, pendulus vel prostratus, elongatus (pedalis et ultra). 



Similis U. longissima et similiter fibrilloso-et divaricato- 



ramulosa. Truncus et rami primarii angulati et spiraliter 



