PYRENOPSIS. 135 



in the same place (Gen. p. 72), questioned whether it were 

 " really dissociable." These granulose species (Pyrenopsis, Nyl.) 

 make a group " precluded by its parenchymatous tissue from the 

 chief structural peculiarities of Collemei ; and, in the last resort, 

 perhaps reconcilable with those only by a certain accordance in 

 habit" (Gen. p. 77) separating them from low types of Panna- 

 riei. But Synalissa symphorea is, in every respect, a Collemeine 

 lichen ; and its structure is that, not of Pyrenopsis but Ompha- 

 laria proper, in which we already have fruticulose types. (*) 



Sect. 1. Omphalariei, Koerb. Thallus either granulose, 

 fruticulose, or reduced-folidceous, attached only at the centre; 

 gonimia, for the most part, collected in clusters. 



XXV. PYRENOPSIS, Nyl. 



Apothecia very small, depressed-globose ; the disk con- 

 tracted and urceolate, or now at length open. Spores ovoid- 

 ellipsoid, simple or bilocular, decelerate. Spermatia oblong, 

 or now filiform and bowed (n. 5) on simple sterigmas. Thal- 

 lus coralloid-granulose ; or still more reduced and even 

 filmy; the texture parenchymatous throughout j the go- 

 nimia in clusters ; or, more rarely, in chains. 



Humble plants, resembling brownish or blackish stains, which 

 the lens shews to be scurfy ; on rocks. But little is known as 

 yet of them here. 



* Gonimia disposed in clusters. 



1. P. Schcereri (Mass.) Nyl.; thallus of minute, corallinoid 

 granules, crowded together into areole-like groups, and forming 

 a broken, blackish crust ; apothecia very small, lecanoroid; the 



(*) Nylander has indeed lately (Collemacei <$ ccett. Cubani Novi, in 

 Flora, 1875) referred the most elegant of these (the Cuban 0. Wrightii 

 of the present writer) to his Synalissa ; but the reference is determined 

 perhaps rather by the marked fruticulose habit of the plant, as the Cuban 

 lichen offers no important distinction in structure from his Omphalaria. 

 "In textura thalli," he remarks however, " observatur, filamenta apice 

 divisa in gonimia abire, ita ut hi apices filamentorum singuli in impres- 

 sione gonimii levi infigantur, et sic 3 vel 4 scepius gonimia sub-botryose 

 infixa conspiciantur'" (Nyl. 1. c.) an observation capable perhaps of 

 being understood in more than one way; and hardly to be taken as 

 meant to suggest a structural difference between the two groups ! 



