34 REV. W. A. LEianXON OS A NEAV UMBILICAKTA. 



Burcholl ill the course of his travels- Tlie paper containing the 

 specimens of the present lichen had written upon on it " P — 22. 

 3, 14. — 5098-9. — Lichen liturans — pulchre citrinvim, grows only 

 on the perpendicular side of vertical strata, which it paints with 



large streams of yellow, as if washed down from the top by rain. 

 Tlie figures ^^ 5098-9," no doubt represent the number in the 

 entire collection. By reference to Dr. Burchell's MS. Journal at 

 Kew this very interesting lichen is entered as collected March 

 22, 1814, by Dr. Burchcll himself at the Cape of Good Hope, which 

 he left in 1815. 



Umbilicaria flavo-virescens, Leight., n. sp. Tbalhis monophyl- 

 lus, interdum subcomplicatus, iimbilicato-adfixus, coriaceo-firmus; 

 crassiusculus, citrinus vel flavo-virescens; opacus, Isevis, laciniatns, 

 rotundo-lobatus, undulatus, subtus fusco-niger^ scabridus ; apothecia 

 arete iiisidentia^ promimda, aggregata, potissime subperipherica ; 

 discus plano-convexus, niger, flavo-pruinosus, margine thallino flavo- 

 virescente cinctus ; sporse 8, rotundato-oblongse, medio constricti- 

 useulae, uniseptatse, fuscse ; paraphyses discretai ; gelatina hymenea 

 iodo eserulescente ; spermogonia arthrosterigmatibus munita, sper- 

 matia gracilia cylindracea. 



Ad saxa granitica; Cape of Good Hope (Dr. Burchell in herb. Hook.). 



So far as I know, there is only one other species of TTmhili' 

 carta which approaches this in its fuscous 1-septate spores, V. 

 Tiaplocarjpa^ Nyl. (Lich. Exot. 217), a native of Peru, but which 

 is abundantly distinct by its cinerasceut thallus, the hirsuties 

 of the under surface, and the number (6) of the spores. To be 

 certain, I forwarded a frustule to Dr. Nylander ; and he replies 

 (in litt- March 10, 1867) " Aucuu Zfmhilicaria ne m'a oiFert rien 

 d'approchant de ce que vous nommez U. Jlavo-virescens^ Leight." 

 In a subsequent letter Dr. Nylander expressed his belief that this 

 Umhilicaria was identical with JEndocarpon ThuTibergi^ Ach. 



The spermogonia are plentifully scattered over the surface oi 

 thethaUus as minute black dots ; and the contents are those pecu- 

 liar to the genus. ' A section of the thallus shows a loose yellow 

 epidermis, then a pale brown stratum of minute cells, belo^v 



I 



which is a broad stratum of larger cells, plentifully interspersed 

 with small-sized gonidia ; then a large mass pf interwoven fila- 

 ments, with larger gonidia "scattered here and there in clusters 

 of two, three, four, or more; below this is a narrow band of 

 brownish minute cells, covered externally with the verrucsp of 

 the under surface. The apothecia burst through the epidenm?, 

 which they in a manner upheave; and in the jowng state their 



