(72 ) 
of Eucollemei, that it may well be questioned whether Synalissa sym- 
phorea be really dissociable from OMPHALARIA, DR. & Mont. Typically 
indeed, as its name implies, this last group is an assemblage—alniost 
wholly the result of enquiries since Acharius, and confined mainly to cal- 
careous rocks of the warmer regions of the northern hemisphere, and of 
intertropical countries — of frondose lichens, attached like Umbilicaria at 
a single point; and though looking, in some reduced, and otherwise dis- 
crepant states (0. coralloides (Mass., Nyl.) towards the similarly reduced 
European condition of Synalissa symphorea, it scarcely appeared to offer 
any type comparable externally to the unmistakably fruticulose American 
lichen (S. spherospora, Nyl.) It is interesting then that one of the five 
remarkable species of Omphalaria which the calcareous rocks of the 
island of Cuba have yielded to the research of Mr. Wright, is perhaps 
the most elegant, fruticulose Collemeine lichen known as yet to science; * 
and that the habit and texture of this associate it with Omphalaria.? As 
defined by Nylander (Syn.) the structural difference of the Collema- 
ceous group before us turns on 1, the immersed or innate, urceolate or 
even endocarpeine, or now tuberculiform apothecia, and 2, the solitary, 
or only at length glomerulate collogonidia; both features (as respects the 
Collemeine type) of degradation, which refer the group, notwithstanding 
its foliaceous thallus, to the next neighbourhood of Synalissa and Pyren- 
opsis: but neither of these characters is without exceptions, and there 
is no doubt that Omphalaria ascends finally towards, if it does not lose 
itself in Collema. It is here the place to notice the remarkably recedent 
Phylliscum,* Nyl. A globular, or persistently more or less closed, often 
' Omphalaria Wrightii (sp. nova) thallo centro affizo fruticuloso sub-dicho- 
tomo-ramosissimo olivaceo-viridi, subtus pallidiore, ramis teretibus implexis; 
apotheciis terminalibus globosis sub-clausis. Spore in theeis cylindraceis octone, 
ellipsoidee, simplices, incolores, longit. 0.016-23™™., crassit. 0.009-16™™-; para- 
physibus filiformibus. Shaded places on limestone cliffs, Island of Cuba; Mr. 
Wright. Texture of thallus that of Omphalaria as limited by Nylander; the 
mostly solitary collogonidia interspersed among conspicuous filaments. As seen 
in a cross-section, the filaments appear to be rather grouped at the centre, with 
but few gonidia; and the principal mass of the latter is collected at the circum- 
ference. Other instances of such return to structural regularity in fructiculose 
Collemei are indicated in Nyl. Syn. p.13. Fronds at length one inch in diameter. 
° It may be observed here that Fries has anticipated the at least possible refer- 
ence of his Synalissa to the later Omphalaria, DR. & Mont., by himself referring 
Omphalaria phyllisca to the type first named. (Summ. Veg. Scand. (1849) p. 
563). 
3 It is a generally recognized rule that the historical connection of the original 
describer of a species with his plant shall be preserved by the retention of the 
specific name (unless quite inadmissible) first given to it; and the injustice of 
wholly supplanting Endocarpon phylliscum, Wahl., by Phylliscum endocarpoides, 
Nyl., is clear, The accurate author of the Flora Lapponica left little for 
systematic science to add to the history of the plant which he discovered and 
