ON THE GENUS WIDDRINGTONIA. 267 
Puyscta STELLARIS, Nyl. Syn. 424. 
Another cosmopolitan plaut, but not typically alpine. A small 
specimen found growing with Parmelia cetrata on stems of 
Phylica. 
STICTINA FULIGINOSA, Nyl. Syn. 347. 
Fairly common in all continents except Asia. Only a small 
specimen of this plaut was collected on Gough Island, and it 
belongs, I think, to this species. 
The collection also contains some fragments of a Parmelia 
plant, one of which might be Parmelia saxatilis, Ach., but they 
are too imperfect to admit of precise identification. 
Notes on the Genus Widdringtonia. By Maxwett T. uikrens, 
M.D., F.R.S., F.L.S. Correspondent of the Institute of 
France. 23 
[Read 15th June, 1905.] ls C d 
Fon reasons assigned in a communication made to the Society in 
December 1892 *, it was deemed expedient to treat the genus 
Widdringtonia of Endlicher as distinct from the North-African 
Tetraclinis and the Australian genera Callitris and Actinostrobus, 
although the resemblances between them are so great that there 
can be no hesitation in believing them to have had a common 
origin. 
Reference may be made to the communication already alluded 
to for a statement as to the differential characteristics between 
the genera above named. It may, however, be here mentioned 
that one of the African species to be hereafter enumerated has 
six scales to the cone, and in so far breaks down the character 
employed as differentiating Widdringtonia, which usually has 
four scales, from Callitris, which has six. This exceptional case, 
however, is not suflicient to invalidate the general rule. The 
synonymy of the genus may be thus expressed :— 
* Journ, Linn. Soc., Bot. vol. xxx. (1895) pp. 11, 15, 16. 
