DR LAUDER LINDSAY ON NEW LICHENICOLOUS MICRO-FUNGI. 527 



Leeanora atra v. verrucoso-areolqta, Schggf. Exs. 538. Hymenium pale rose-coloured. 

 Asci give no blue. According to Nylander (Scand. 192), the hymenial gelatine of 

 Verrucaria verrucoso-areolata becomes yellowish-red. 



Physcla stellaris v. ambigua, Schaer. Exs. 351. Asci-tips pale brown. 



Squamaria cpassa, Ach., Leight. Exs. 5. Hymenium dirty palish blue or violet. 



Opegrapha dendritica, Schter. Exs. 585. Hymenial gelatine pale lilac. 



0. vulgata, Ach. v. vulgata, Leight. Exs. 194. Asci violet. 



Arthonla cinnabarina, Wallr., accompanying Opegrapha atra in my copy of Leighton's 

 Exs. 245. Some asci very pale purple. 



Verrucaria rimosicola, Leight. Exs. 253. Hymenial gelatine violet; asci not blue. 



V. subalbicans, Leight. Exs. 200. Hymenium violet or lilac; hypothecium pale blue. 



V. epigcea, Ach. (apparently), accompanying Squamaria saxicola, in my copy of Leigh - 

 ton's Exs. 145. Hymenial gelatine palish purple or violet; asci not blue. Accord- 

 ing to Nylander (Scand. 276), hymenial gelatine becomes blue. 



V. gewmifera, Tayl. Glenfarg, April 1858. Hymenium pale rose-red; no blue tinge. 



On the other hand, I found a very marked lichenic reaction — a beautiful and 

 more or less deep blue — with iodine in certain plants, generally regarded by 

 fungologists as fungi ; but now classed by lichenologists as lichens, on the sole 

 ground apparently of this supposed diagnostic reaction. In Xylographa parallela 

 v. pxdlens, Nyl. Exs., the asci and hymenial gelatine gave a beautiful blue. In 

 X.flexella, Nyl. Exs., they gave a deep blue ; and in Agyrium rufum, Nyl. Exs., the 

 hymenium became blue* I have elsewhere f cited instances of what are still 

 regarded, alike by lichenologists and fungologists, as fungi, giving so-called lichenic 

 reactions with iodine. Sphceria ventosaria, which Mr Currey considers ,; a true 

 Sphceria" gave me in its hymenium a violet or carmine with iodine; while in a 

 plant lately submitted to Mr Berkeley, and by him regarded as a " Peziza of the 

 tribe Patellea^ the asci sometimes give a blue, sometimes no reaction with iodine. 



This Peziza (which appears to be new, and for which, if it is so, I propose the 

 specific name lichenoides), is associated with Lecidea parasema and disciformis on 

 the bark of fir trees, Morchone, Braemar, collected by myself in August 1856. The 

 apothecia are apparently sub-stipitate; this appearance being produced by the dis- 

 integration of the fibres of the bark on which they are seated. They vary greatly 

 in form and size, being variously angular or oblong, or irregularly subspherical. 

 The margins are involute to various degrees. They are always black ; frequently 

 wavy both in surface and outline, and generally thin. The paraphyses are very 

 delicate, filiform, wavy, without coloured tips. The asci are long and sublinear 

 or clavate, springing in groups or tufts from the hypothecium. The sporidia are 

 innumerable in each ascus; atomic, subellipsoid or subspherical. The protoplasm, 

 which is gradually developed into sporidia, closely occupies the cavity of the asei, 

 separated only by a very narrow margin or double contour. Externally the 

 Peziza has much of the character of a Patellaria, e.g., P. atrata (as described in 



* In Berkeley's " British Fungology " (1860; p. 375, both Agyrium and Xylographa figure 

 among fungi, the latter having rank as a subgenus under Stietis. A. rufum and X. parallela are 

 mentioned; but not X.flexella (unless it be as Peziza flexella, Fr., p. 371), which, however, appears 

 associated with X. parallela in Nylander's " Prodromus, ' p. 148, as a lichen. 



•j - "Parasitic Micro-lichens;" Arthonla melaspermella, p. 284. 



