PLATE IV (continued). 

 Fig. 

 6. — Pycnides of A. Smithii. 



a. Showing the stellate-fissured ostiole. 



b. Section showing cavity b, and ostiole c. 



7. — Portion of tliallus bearing A. oxysporus, mag. 



a. Mature apothecia. 



b. Young or emergent apothecia causing radiate-fissuring of cortical 



layer. The squamule is covered with a network of such fissures. 



c. Spermogones iutermixed with young apothecia. 



d. Black-fibrillose under surface. 



8. — Section, showing the relation of the apothecia of A. oxysponis to the 

 matrix. 

 a, b. Young apothecia covered by a veil of cortical tissue. 



c. Mature apothecium ; flattened, resembling a plano-convex lens. 



d. Mature apothecium ; convex and discoid. 



9. — Showing relation of spermogones to the apothecia of A. oxys'porus. 



a. Mature apothecia. 



b. Mature spermogone. 



c. Young or non-developed spermogone. 



10. — a. Young apothecium of A. oxysporus causing Assuring of the cortical 

 tissue of matrix, through which it is bursting. 

 b. Spermogones. 

 11. — Section of portion of apothecium of A. Smithii. 



a. Tips of paraphyses, of a much darker brown than those of A. oxy- 

 sporus. 



b. Filaments of paraphyses. 



c. Hypothecium, consisting of a brownish cellular tissue. 



d. Young thecse, full of a homogeneous or finely granular, j)ale or 



colourless protoplasm. 



e. Mature theca full of nearly ripe spores. 



f. g. h. Thecae at earlier stages of development. The button-like 



markings of the young spores is shown at/". 

 i. Apparent membrane connecting the apices of the paraphyses. 

 12 — Spores of A. Smithii in different stages of development. 



a. Mature spores showing the two loculi and their unequal size, as 



well as the nuclei which frequently occupy them. 



b. Deformities by elongation. Usually found only in old apothecia 



and in Highland specimens. 

 e. Young spores, showing the gradual division into loculi, the appear- 

 ance of nuclei, and the acquirement of colour. 

 13.— Old spores, undergoing a process of disintegration. 

 14. — Paraphyses of A. Smithii, isolated. 



a. Unaffected by reagents, showing dark brown extremities. 

 h. Under action of aqua potassse, showing the terminal cells, wliich 

 have acquired a resemblance to stylopores. 

 15. — Section of a portion of the apothecium of A. oxysporus. 



a. Showing action of iodine on the thecae. 

 16. — Spores of A. oxysporus in different stages of development. 



a. d. Mature spores, showing the occasional double contour and 



terminal nuclei. 



b. Deformities by elongation. 



c. Spore in process of germination. 



a, f. Old spores, undergoing a process of disintegration. 



g. Young spores with a granular protoplasm. 



