. 90 REPoiiT— 1807. 



the lower Licliens, in species, e. g., of the genera Verrucaria, Stigmatidium, Strigula, 

 Calicium, Lccidca, AbrothaUus, Opegrapha, Graphis, Arthonia, Trachylin, Lecanora, 

 though they were also found in a few of the higher Lichens, e. g. in species of 

 Pannelia, Boccella, and Alectoria. 



The following short catalogue of species, in which the author met with devia- 

 tions from, modifications of, or additions to, the ordinary reproductive organs or 

 corpuscles, illustrates the general subject of his paper, and may indicate the direc- 

 tion in which future observation is likely to prove useful, either by correcting the 

 errors of previous authors, or by confirming and extending their results : — 



I. Genus Vemicaria. 



V. Taglon, V. chlorotica, V. nitida, V. cpidermidis, V. hifonnis : two or 



more forms of spermogonium or pycnidium. 

 V. gemmata : spermogonia and pycnidia. 

 V. glahrata : two forms of spennatia and sterigmata. 

 V. afomaria : spermatia and sporidia in same perithecium. 



II. Genus Arthonia. 



A. cinereo-prutnosa : two or more forms of spermogonium. 



A. 2}rmnosa : pycnidia. 



A. pndnom, var. spilomatia : two forms of .stylospores and basidia. 



A. (tstroidea : spermogonia and pycnidia. 



A. astroidea, var. Swartziana : two forms of stjdospores and basidia. 



III. Genus Opcgrapha. 



O. herpefica, 0. ridgafa : two or more forms of spermogonia. 

 O. atra, O. varia : pycnidia. 



IV. Genus Lccidca. 



L. parasema, L. drgina : two forms of spermogonia. 



L. luteola, L. petrcra, L. anomala, L. disciformis, L. albo-atra, L. C'ladoniaria : 



spermogonia and pycnidia. 

 L. enterolciica : pycnidia in lieu of spermogonia. 

 L. abietina : pycnidia, and two forms of spermogonia. 

 L.Jle.vuosa : pycnidia. 



V. Genus Lecanora. 



L. subftisca, L. atra, L. Ehrharfiana, i. varia, especially var. aiiema : pycni- 

 dia, and two or more forms of spermogonia. 

 L. umbrina : pycnidia. 



L. cerina : two or more forms of spermogonia. 

 Similar reproductive irregularities occur inter alia in the genera Strigula and 

 AbrothaUus: Graphis scriptn, Stigmatidium crassuni, Trachylia tigillaris, Itoccella 

 lilontagnei, Parmclia siniiosa, P. sa.vatilis var. sulcata, Alectoria jubata, A. lata, iScu- 

 tula M'allrothii , Neuropogon mcla.vanthus xar. ciliatiis. 



The pseudo-genus Pgrcnothea may be regarded as an excellent illustrative group 

 of the organs in question, especially those sections of the genus represented by the 

 old .species : — 



1" 1 Pgrcnothea vermicellifera. I P. aphanes. 



' I P. leucociphala. III. < P. rudis. 



II. P. corrugata. [ P. byssacea. 



The paper also notices certain resemblances in form between stylospores and 

 sporidia, and points out that pycnidia are much more prevalent amor^g Lichens than 

 is at present supposed. The author describes at length the anatomical or structural 

 distinctions between spermogonia and pycnidia : and makes certain observations on 

 their presumed respective functions, and in general on the physiology of the secon- 

 dary reproductive organs and corpuscles of Lichens. It woidd appear, from the 

 author's researches, that links connecting the Lichens with the Fungi more and 

 more closely are constantly being discovered ; and that in particular the same 

 plurality of reproductive organs which characterizes the latter will be found 

 probably to a less extent to cliaracterize the former*. 



^" Vide also tlie following papers by the author : — 



I. In Transactions of Eoyal Society of Edinhiu-gh, vol. xxii. p. 101, " Spermogonia and 

 Pycnidia of the Jligher Lichens ;" vol xxiv. p, 407, " New Zealand Lichens and Fungi." 



