OMPHALARIA. 139 



* 



Synalissa. Thallus fruticulose ; the gonimia disposed in 

 clusters. Apothecia globose-lecanorine. Spermatia either ellip- 

 soid (n. 1) or filiform (n. 2). 



1. 0. symplwrea (DC.); thallus pulvinate, minute, rigid; 

 sparingly or at length dichotomously divided, with short and 

 stout, torulose branches ; apothecia terminal, globose ; the co- 

 arctate, concave disk at length dilated and bordered by an ob- 

 tuse margin. Spores more commonly 12-16 in the thekes, ellip- 

 soid and globular, simple, decolorate, ^- 4 mic. Synalissa, Nyl. 



Scand. p. 27. 8. symphorea & sphcerospora, Nyl. Syn. 



Calcareous rocks, Alabama (Peters], Tuckermanin Nyl. Syn. 

 1858. 



The European lichen is not always as well-developed as ours, 

 but the two are inseparable in species. The plant starts as a 

 glebous-squamaceous frond with the aspect of 0. pyrenoides. 

 As this grows it takes on more of the look of 0. umbella, above 

 as well as below ; and only finally assumes its fruticulose char- 

 acter. 



2. 0. Texana, Tuckerm. ; thallus nodulose-sub-fruticulose, 

 of the size and with the texture and colour of n. ] j apothecia 

 unknown. Spermogones situated like and resembling apothecia, 



containing filiform, bowed spermatia; on simple sterigmas. 



Synalissa, Gen. Lich. p. 80. 



Calcareous rocks, very sparingly, Texas (Wright), Tucker- 

 man I. c. 1872. 



Like a nodose or undeveloped form of n. 1, but becoming 

 somewhat branched. Internal structure also similar, except 

 that the larger gonimia (reaching 14 mic. at least in diameter) 

 have much the look of those of the next following species though 

 only of half the size. 



* * Endocarpoma. Thallus foliaceous, with the habit 

 and texture of tlee following section, with which this also agrees 

 in the evolution of the gonimia ; but the latter larger than usual, 

 and soon solitary. Apothecia immersed and persistently nuclei- 

 form. Spermatia filiform. 



3. O.phyllisca (Wahl.) Tuckerm. ; thallus small, rigid, rosu- 

 late, black, the rounded lobules conspicuous at the periphery 

 but less so at the centre, or more rarely somewhat imbricate ; 

 apothecia minute, depressed-globose; the urceolate disk with a 



