DR. LINDSAY ON WEST-GREENLAND LICHENS. 309 
therefore, in the present memoir, adopted Berkeley's suggestion thatthe terms asci and spo- 
ridia should be substituted for thecæ and spores. In his * Outlines of British Fungology ’ 
(1860), he defines an ascus to be “a delicate sac containing sporidia," and sporidia as 
‘reproductive cells produced within asci or sporangia from a transformation of their 
endochrome;" while spores are “ reproductive cells borne freely on the sporophores” *. 
In the ‘Treasury of Botany’ (1866), he describes thece as a now obsolete and unneces- 
sary term. Whether or not it is unnecessary, it cannot be considered obsolete so long 
as it is used by so voluminous and original a lichenographer as Nylander. Kórber and 
Th. Fries employ the term “asci,” but not **sporidia," agreeing with Nylander in 
preferring the term ““spores.” There is thus considerable difference in the nomen- 
clature by different authors of the same organs in lichens; and hence a confusion arises, 
which can only be remedied by the substitution of a uniform nomenclature, one appli- 
cable to the same organs in both fungi and lichens. 
I have here also followed the German school of lichenologists in describing simple 
sporidia as monoblastic or unilocular, and compound ones as 2-, 3-, or poly-blastic or mul- 
tilocular. Mudd has adopted this nomenclature in his ‘British Lichens” (1861); but 
Nylander prefers to designate compound sporidia as septate spores. It does not appear 
to me that the one nomenclature has any marked superiority over the other. But it is 
most desirable here, as in the case of “asci” and “ sporidia,” that there should be 
uniformity of nomenclature for the same organs, not only among lichenologists, but 
common to fungologists and lichenologists. 
II. Enumeration of Lichens collected, with special Commentary thereupon. 
Genus 1. EPHEBE. 
Sp. 1. E. pubescens, L. Egedesminde. 
Genus 2. COLLEMA. 
1. C. melenum, Ach.— Associated with Cladonia cervicornis, Jakobshavn. In Europe 
the thallus is sometimes the seat of a parasitic Spheria t. 
2. C. flaccidum, Ach.—Jakobshavn. Agrees in characters with the English plant 
(E. Bot., t. 2197). I do not think the mere character of the sporidia sufficient to sepa- 
parate Synechoblastus as a genus from Collema. 
The foregoing Collemata occur in Brown's collection as mere scraps, and not in fruit. 
Genus 3. CALICIUM. 
1. €. furfuraceum, L.—On loose soil about the Illartlek glacier. Apothecia young, still 
green : contain no sporidia. Has the usual citrine-yellow thallus and other characters 
of the European plant (E. Bot., t. 1910 ¢, and Scherer’s Exs. 14). Apparently the only 
representative in Greenland of the large European family Calicia. It grows also in 
* Glossary, pp. 411 & 414. 
+ Vide author's “ Memoir on Spermogones and Pycnides,” Trans. Royal Society of Edinb., vol. xxii. p. 272. 
+ The references to the plates of the ‘English Botany’ apply to the second edition (1843). 
