DR LAUDER LINDSAY ON NEW LICHEN ICOLOUS MICRO-FUNGI. 



555 



Fig. 20. Associated with Verrucaria fusiform is. Dou- 

 glas, Cork. Sporidia. 



Fig. 21. Associated with Graphis scripta. Leighton's 

 Exsic. No. 244. Sporidia. 



Fig. 22. MicrotlieliaCollemaria,onColleniamuscicolum, 

 Ach. On walls, Ingleby, Cleveland, York- 

 shire, Mudd, 1857. (Compare Parasite 

 (Sphmria or Microthelia) on C. melcenum, 

 Ach., in Linds. " Otago Lich. and Fungi," 

 p. 442; and "Mem. Spermog." p. 272.) 



(a) Section of hymenium, showing an ascus 



and paraphyses ; with the reaction of 

 iodine on the hymenial gelatine. 



(b) Mature sporidia. 



Fig. 23. Parasite on Usnea barbata, var. florida. Rio 



Janeiro. Sporidia. 

 Fig. 24. Parasite on Urceolaria. Glenarm, Co. Antrim. 



Spores or stylospores. 

 Fig. 25. Associated with Opegraplia atra, Leighton's 



Exsic. No. 245. Sporidia. 

 Fig. 26. Associated with Opegraplia atra, Schaerer's 



Exsic. No. 634. Ascus and sporidia. 

 Fig. 27. Sphmria Hooheri, on Lecidea sphcerica. 

 Schaer. (Exsic. No. 526). Sporidia ; 

 (a) One of them preparing to germinate. 

 Fig. 28. S. Hookeri (sub-nom. Verrucaria), in Herb. 

 Kew. 

 (a) Specimen from the summit of Ben 

 Lawers ; perithecia magnified and sec- 

 tioned. 



(b) Specimen from the Gemmi, Switzerland ; 

 Sporidia. 

 Fig. 29. Accompanying Endocarpon rufescens, Ach. 

 Schaerer's Exsic. No. 465. Ascus with 

 young sporidia. (Perhaps Endocarpon 

 cinereum, Pers. ?) 

 Fig. 30. Associated with Physcia astroidea, Ft., var. 

 dementi, Turn. Sporidia. (Perithecia 

 verrucarioid.) 

 Fig. 31. Associated with Umbilicaria hyperborea, 

 Hffm., Schaerer's Exsic. No. 151. Sporidia. 

 Fig. 32. Parasite on Lecidea sanguinaria, var. affinis. 

 Schaer. Exsic. No. 629. 

 (a) Sporidium. 

 (6) Spores. 

 Fig. 33. Associated with Abrothallus Smithii, Tul. 

 Craigie Hill, Perth. 



(a) Perithecium of dark-brown hexagonien- 



chyma ; parasitic on thallus of Par- 

 melia saxatilis. 



(b) Mycelium; (1) spores, and (2) oil globules. 



(c) Spores. 



Fig. 34. Associated with Abrothallus oxysporus, Tul. 

 Craig-y-Barns, Dunkeld. Toruloid spore- 

 filaments and spores. 



Fig. 35. Associated with Lecidea lurida, Ach. In 

 Herb. Kew. Sporidia. 



(a) On seaside rocks, Ireland, Miss Hutchins. 



(b) Seaside rocks, Bangor, July 1802. 



