DR LAUDER LINDSAY ON NEW LICHENICOLOUS MICRO-FUNGI. 521 



by Gtbelli * This observation is one obviously of much interest in regard to the 

 physiology of reproduction, and of the reproductive organs, in lichens. I doubt 

 not that careful observation will yet multiply the number of instances in which 

 different forms of reproductive corpuscles exist in the same perithecium or organ. 



Tt may be provisionally convenient to classify the parasites grouped under 

 Microthelia, according to the character of their contained reproductive corpuscles, 

 as follows (omitting any specific mention of those whose reproductive structure 

 is imperfect, and which are, therefore, for the present indeterminable) : — 



Sporidia, or reproductive corpuscles — 



1. Simple. For the most part spherical and brown. 



Microthelia atricola. Parasites on (c.) Graphis scripta. 



Spilomiuin Graphideorum. 

 Gassicurtia silacea. 

 Parasites on 



(a.) Lecidea rupestris. 



(b.) L. sanguinaria v. affinis. 



(d.) Pertusaria. 

 Parasites accompanying 

 (a.) Opegrapha atra. 

 (b.) Abrothallus Smithii. 

 (c.) Pyrenothea verrucosa. 



2. 1-septate ( = bilocular). 



A. Brown, in maturity ; frequently or generally soleaform. 



Parasites on 



(c.) Squamaria crassa. 



Microthelia Stereocaulicola. 

 rugulosaria. 

 Stictaria. 

 parietinaria. 

 Parasites on 



(a.) Lecidea pachycarpa. 

 (b.) Thelotrema lepadinum. 



(d.) Endocarpon microsticticum. 

 (e.) Usnea barbata v. florida. 

 (/.) Lecanora pyracea. 

 Parasite accompanying 

 Verrucaria fusiformis. 



B. Colourless or yellowish ; sometimes simple. 



Microthelia Cookei. 

 Parasites on 



(a.) Lecanora cenisia; brownish- 

 yellow. 

 (6.) L. polytropa v. intricata ; 

 sometimes simple; colourless 

 or yellowish. 



Parasites on 



(c.) Lecidea Hookeri; colourless. 



(d.) Verrucaria Garovaglii; colourless. 

 Parasites accompanying 



Verrucaria epidermidis v. analepta ; 

 colourless. 



* So long ago as July 1856, Mr Rerkeley wrote me — -" You are aware, probably, that in a 

 species of Tympanis, Mr Broome and myself have seen on the same hymenium the spores of a Diplodiu 

 and true asci. Tulasne doubts Mr Broome and myself having seen stylospores on the paraphyses 

 of a lichen. Nothing, however, was more clear and free from illusion. Almost in the same breath 

 Tulasne calls in question the correctness of Hooker and Babington's observation. He should not do 

 this. I sent Tulasne the very section we had seen the stylospores of the lichen in, but he could see 

 nothing. Unfortunately, there were but two or three scattered apothecia on the roots of Ammophila, 

 sent for a fungus by Gardiner. I have in vain tried to get more from the same locality." {Vide 

 also my " Monogr. Abrothallus" p. 55; Nylander's " Prodromus," p. 55; Berkeley's "Brit. 

 Fungology," p. 87, plate i. fig. 13.) 



In December of the same year Mr Berkeley again wrote me (in regard probably to Abro 

 thallns Smithii) — " In American specimens of your plant I sometimes find asci, sometimes naked 

 spores, which have the same relation to the asci that the stylospores of Diplodia to the asci of the 

 Sjiheeria to which they belong. Whether the production in question is a lichen or fungus is a knotty 

 point. It grows on living bark, and therefore should be a lichen /" 



VOL. XXV. PART II. 6 T 



