286 NATURAL HISTORY SOCIETY OF DUBLIN. 



cimen can hardly be carried away. 

 On this specimen is also seen a parasitic 

 Verrucaria, with fuliginous spores. 



Usnea {Dill.). 



No. 363. — Usnea barbata (Fr.). Luggelaw. T. J. 



The dense form, as it grows on rocks. 

 No. 364. — Usnea calicaris farinacea (Ach.). On rocks, Luggelaw. T. J. 



Fruited, both terminal and lateral. 



Verrucaria ( Wig.). 

 No. 395. — Yerrucaria acrotella (Ach.)* Tayl. 



A Verrucaria, certainly ; but neither asci 

 nor spores are formed, and the plant 

 must remain undetermined. 



*No. 367. — Verrucaria? Cataractarum (Hepp). Sea shore, Portrane. 

 D.M. 

 The external appearance of this plant 

 would refer it to V. rupestris, or V. mu- 

 ralis ; but its spores are similar to those 

 of V. pyrenophora, as that plant occurs 

 on tbe Armagh limestone (see No. 63). 

 This Verrucaria belongs to Nylander's 

 division, " paraphyses none." At first 

 the apotbecium is included; as it 

 emerges, it carries with it small portions 

 of the obscure thallus and the matrix ; 

 at maturity it is hemispherical, im- 

 mersed as to its lower portion, dimi- 

 diate; asci large, 8-spored, 3-septate, 

 sometimes only 1-septate, slightly bent ; 

 of a pale red colour ; -0011" by -0005"; 

 with iodine, hymenial gelatine wine- 

 red. This is probably Verrucaria Ca- 

 taractarum (Hepp.). No. 99. 



*No. 383. — Verrucaria chlorotica, v. carpina (ScJi.). Castlebarnard. 

 Co. Cork. J. C. 



No. 393. — Verrucaria circumscripta. (Tayl.).] Named by Nylander 

 Stigmatidium circumscriptum {Tayl.) 

 = Stigmatidium leucinum (JVyl.) \ 

 Certainly not a Verrucaria.j Mudd has 

 named the plant Stigmatella. I admit 

 the plant is anomalous. It has asci and 



* " Fl. Hib.," p. 94. t lb., p- 96. % "Manual," p. 252. 



