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DR LAUDER LINDSAY ON NEW LICHEN 1COLOUS MICRO-FUNGI. 



my "Otago Lich. and Fungi," p. 427). It has also certain resemblances to a 

 Hysterium, e.g., H. pulicare, P. The asci and sporidia are similar to those of 

 what, now regarded as a lichen, was by Fries the elder considered a Peziza. 

 viz., Lecidea (Peziza) resince, Fr. ( = Biatorella, Mudd, p. 191).* From that 

 Lecidea or Peziza, P. lichenoides differs only in the colour of its apothecium. 



The asci of A brothallus Smithii, which Nylander regards as a fungus , and 

 Berkeley fas a lichen, though they generally give no colour-reaction with iodine, % 

 have, in one instance at least, yielded in my hands the Hellenic blue, less distinct, 

 however, than in A. oxysporus. In the latter species, on the other hand, which is 

 equally by fungologists and lichenologists admitted to be a lichen, while iodine 

 generally developes a vivid and beautiful blue in the asci, this reaction is some- 

 times either obscure or absent; and the same remark applies to many true lichens, 

 which generally exhibit the typical iodine-reaction. 



Sphceria {Siereocaulicola), Th. Fries, and Leptosphceria (Lopadiicola), Th. Fries 

 (Lich. Spitsb. p. 34), give in their hymenium a yellow iodine- reaction. But, accord- 

 ing to the same careful observer, Fries the younger (in his "Lich. Spitsbergenses," 

 where he has recorded the iodine- reactions of most or many of the lichens therein 

 described), the same reaction § is exhibited by the following true lichens: — 



Leptogium lacerum and tenuissimum; \ 



Collema pulposum; > 



hymenium, except the sporidia; ) 

 L. scotinum ; sporidia. 

 Splicer ophoron fragile; medullary tissue (of 



thallus.) 

 Gyrophora cylindrica; sporidia. 

 Lecanora flavida; sporidia and protoplasm of 



the asci. 

 L. mastrucata ; hymenium. 

 L. calcarea; do. 



Lecothccinm asperellum ; protoplasm of asci. 

 Pannaria arctophila ; spondia. 

 Lecidea pezizoidea ; sporidia and paraphyses. 

 Emhicarpon pulvinatum ; protoplasm of asci. 

 Microglcena sphinctrinoides ; sporidia. 

 Stawothele clopima; sporidia and protoplasm of 



asci. 

 Thelidium pyrenophorum ; sporidia. 

 Vermcaria extrema; do. 



Artlinpyrenia conspurcans ; protoplasm of asci. 



Some of the parasites, Avhich I have grouped meanwhile under Microthelia, 

 were lately submitted to Mr Berkeley, in the hope that he might claim a portion 

 at least as fungi proper. But only one of them, what I have described as M. 

 Nephromiaria, he refers to Sphceria and the fungi. The remainder he considers 

 lichens belonging to the genera Vermcaria, Celidinm, and Abrothallus. To Verm- 

 caria he refers M. Umbilicarioe and M. Basomycearia ; to Abrothallus the parasite 



* Quoad the asci and sporidia it also resemhles Lecanora cervina, Pers., Lecidea morio, Sch., 

 L.fossarum, Duf. of Nylander' s Exs., and L. pruinosa, Sm. 



| "I think," writes Mr Berkeley, in Feb. 1869, "Tulasne is quite right in making Phacopsis, 

 Abrothallus, Celldium, and Scutula lichens." 



£ Vide my " Monograph of AbrotJiallus," Quart. Journ. of Micro. Science, Jany. 1857. Nylan- 

 der (Prod. 55) remarks, " Nullam enim mild obtulit notam lichenosam." But what constitutes a "Nota 

 lichenosa?" What diagnostic is there characteristic of a lichen as contradistinguished from a 

 fungus I For my own part, I know of none ! 



§ I have never myself met with in lichens a yellow iodine-reaction, which I did or could not 

 regard as the natural (unchanged) colour of the reagent itself. 



