LICHENS AND FUNGI OF OTAGO, NEW ZEALAND. 



453 



Usnece on the cephalodia of Vsnea barbata. In general terms it may be stated, that 

 I have examined, with a view specially to the detection of this or other para- 

 sites, few species of the genera Sticta, Stictina, or Ricasolia (and especially belong- 

 ing to the groups represented in this country by the types Sticta pulmonacea, S. 

 linita, Ach., or S. scrobiculata, Ach., or in foreign countries by S. fossulata), without 

 succeeding in finding some traces thereof. 



The sterile or imperfect states of various Celidia are not distinguishable from 

 each other, even on the most careful examination ; without the spores, the species 

 cannot be safely determined. The rudimentary or degenerate maculae of C. Stic- 

 tarum and C. Pelvetii are alike ; but the spores are very diiferent, regularly 3-sep- 

 tate and ellipsoid in the one, and equally regularly 1-septate and solseform in the 

 other ; while their site, also in the perfect or fertile condition, is generally diverse, 

 being apothecia in the one case, and thallus in the other. 



Explanation of Plates XXIX. XXX* 



Plate XXIX. 



Figs. 1—5. Abrothallus Curreyi, Linds. 



1. Portion of thallus of Parmelia perforata, 

 Ach. ; nat. size ; bearing 



a. Apothecia (of Parmelia). 



b. A. Curreyi; parasitic apothecia. 



c. Spermogones (of Parmelia). 

 2, 3. Diagrammatic sections (variously 



magnified) of 



2. A. Curreyi, apothecia. 



a. Young. 

 6. Mature. 



3. Spermogones of Parmelia. 



a. Young. 



b. Old. 



4. Section of hymenium of A. Curreyi, 



mag. 425 diam. linear. 



a. Epithecial membrane. 



b. Paraphyses. 



c. Thecae. 



d. Hypothecial tissue. 



5. Spores of A. Curreyi. 

 Fig. 6. Abrothallus oxysporus, Tul. 



Spores ; a. Young. 

 b. Mature. 

 Figs. 7, 8. Lecidea Otagensis, Nyl. 

 7. Section of hymenium. 

 a. Paraphyses. 

 6. Oil globules. 



c. Thecse. 



d. Hypothecium. 

 Fig. 8. Spores ; a. Young. 



6. Mature. 



Fig. 9. Lecidea flavido-atra, Nyl. 

 Spores ; a. Young. 

 b. Mature. 

 Fig. 10. L. melanotropa, Nyl. 



Spores ; Mature. 

 Fig. 11. L. amphitropa, Nyl. 

 Spores ; Mature. 

 Fig. 12. L. coarctata, Ach. 



var. exposita, Nyl. 

 Spores ; a. Young. 

 b. Mature. 

 Figs. 13, 14. Lecanora homologa, Nyl. 



13. Section of hymenium. 



a. Paraphyses. 



b. Theca. " 



c. Hypothecium. 



14. Spores ; a. Young. 



b. Mature. 

 e. Old. 

 Fig. 15. Lecanora peloleuca, Nyl. 

 Spores; a. Young. 



b. Mature. 



c. Old. 

 Fig. 16. L. thiomela, Nyl. 



Spores ; a. Young. 



b. Mature. 



c. Old. 



d. Do. in process of germi- 



nation. 

 Fig. 17. Placopsis perrugosa, Nyl. 

 Spores ; a. Young. 

 6. Mature. 



* From the colours being printed, and not done by hand, the tints, in many cases at least, are more approxi- 

 mative than exact copies from Nature. 



