122 DIE DEUTSCHEN SORDARIEN. 



17. Sordaria pleiospora. Winter. 



Syn. Sordaria Langei. Fckl. Sordaria pleispor a (Winter). 

 Fckl. 



18. Sordaria setosa. Winter. 



19. Sordaria cnrvicolla. Winter. 



20. Sordaria anserina (Babh.) Winter. 



Syn. Malinvernia anserina. Babh. Hypocopra anserina. C6s. 



21. Sordaria minuta. Fckl. 



Syn. Sordaria tetraspora. Winter. 



22. Sordaria curvula. De Bary. 



Syn. Spharia jimiseda. (De Not.) Fckl. (Fung. Blien.) 



Sordaria appendiculata. Awd. Cercophora conica. Fckl. 



(Symb.) Ixodiopsis fimicola. Karst. Schizothecium jimi- 



colum. Corda. 

 Forma coronata. Winter. 



Syn. Malinvernia pauciseta. Babh. Malinvernia breviseta. 



Fckl. 

 Forma aloides. (Fckl.) Winter. 



Syn. Sordaria aloides. Fckl. 



Charles B. Plowright. 

 King's Lynn. 



LICHENOLOGICAL MEMOBABILIA, No. 4. 

 By The Bev. W. A Leighton, B.A. Camb., F.L.S., F.B.S. Ed. 



On the Gonidial-Zoospores of Lichens. 



Much attention lias been of late devoted, and is still devoted, to 

 the subject of the Gonidia of Lichens. Two theories or opinions 

 have sprung from these researches, which are respectively sup- 

 ported by great and learned savans. Those whose studies are 

 chiefly physiological maintain that the filamentous tissue of the 

 thallus of lichens is a fungus which grows parasitically on an 

 alga, which it envelopes and carries on with it in its growth so as 

 to constitute the gonidia. On the other hand, true lichenologists, 

 whilst admitting the apparent similarity of gonidia to certain algas, 

 do not consider them as such, but as special organs of multiplica- 

 tion or propagation of lichens. 



Without offering any opinion as to the merits or demerits of 

 these two theories, the solution of the question certainly appears 

 important, not only as regards lichenology, but botany generally, 

 and, consequently, the least research which, tends towards this end 

 cannot but be regarded as interesting and instructive in a scientific 

 point of view. 



Five years ago Famintzin and Baranetzky published their dis- 

 covery of the existence of zoospores which issued from the gonidia 

 of Physcia parietina, (L.), but this fact has not been since verified 



