148 Mr. Turner's Descriptions of Eight New British Lichens. 



powder of the soredia, which sometimes wholly cover it. It 

 is quite undivided, and has the appearance of a crustaceous 

 Lichen, except immediately at the circumference, never show- 

 ing towards the centre the slightest tendency to become 

 Jobed, so that its place among the Acharian subdivisions of 

 Placodiwn or Circinaria may be considered somewhat doubtful : 

 but, as its nearest affinity is unquestionably with Parmelia stel- 

 laris, I should have no difficulty in assigning it a place near that 

 species. From this, however, and from all others, the description 

 already given will, I trust, always be sufficient to distinguish it. 

 The smallest figure represents a Spanish specimen. 



Parmelia Borreri. 



Parmelia thallo membranaceo stellato dilutissime viridi sorediato, 

 subtus badio fibrilloso; sorediis albis sparsis; laciniis sinuato- 

 lobatis sub-imbricatis margine rotundatis. 

 ' Tab. XIII. Fig. 2. 



On trunks of trees, especially fruit-trees, in Sussex ; not un- 

 common. Mr. Borrer. About Norwich, Coltishall, and Acle. 



Alga arborea, sub-orbicularis, diametro bi-tri-pollicaris. 



Thallus foliaceus, semper, quantum adhuc vidi, rosulae in for- 

 mam expansus, lobatus, lobis distinctis, rar6 sibi incumbenti- 

 bus, vix unquam (ut in P. saxatili) ad centrum divisis, sinuatis, 

 dilatatis, semper margine rotundatis ; thallus arbori, cui innasci- 

 tur, arete appressus, marginibus tantum liberis et erectiusculis, 

 superne glaber, aequalis, neutiquam reticulars vel lacunosus, et 

 in omni aetatis gradu sorediis exiguis, albis, orbicularibus, per 

 superficiem ubique sine ordine ertimpentibus, copiose notatus, 

 inferne nitidus, fibris nigris, sparsis, raris obsitus: color thalli 



recent is 



