. Genera lichenum [microform] : an arrangement of the North American lichens. Lichens; Lichens. ii. iiiiiii rJ'Jl mm (154 ) d. Cryptogamenk.; in Bot. Zeit. 1850, p. 382. Biatora max. p., et So- coligfc sp., Norm. Con. pp. 18-22. Psora, Biatora max. p., Pyrrhospora, Psilolcchia, Biatorina max. p., Bilimbia, Tricholecliia, Bacidia, Ropal- ospora, Sporacestra, Scoliciosponim, Biatorolla, et Chiliospora, Mass. opp. varr. & Auctt. pi. Structuram exposuerunt Tulasne, Mdm. sur les Lich. p. 151, 1G7, t. 10, f. 28-31; Fuisting 1. c. p. 30. Apothecia patelLncformia, excipulo proprio ceraceo colorato
. Genera lichenum [microform] : an arrangement of the North American lichens. Lichens; Lichens. ii. iiiiiii rJ'Jl mm (154 ) d. Cryptogamenk.; in Bot. Zeit. 1850, p. 382. Biatora max. p., et So- coligfc sp., Norm. Con. pp. 18-22. Psora, Biatora max. p., Pyrrhospora, Psilolcchia, Biatorina max. p., Bilimbia, Tricholecliia, Bacidia, Ropal- ospora, Sporacestra, Scoliciosponim, Biatorolla, et Chiliospora, Mass. opp. varr. & Auctt. pi. Structuram exposuerunt Tulasne, Mdm. sur les Lich. p. 151, 1G7, t. 10, f. 28-31; Fuisting 1. c. p. 30. Apothecia patelLncformia, excipulo proprio ceraceo colorato dein sropius cephaloidea. Sporte ex ellipsoideo simplici oblonga3 bi-quad- riloculares 1. fusiformes 1. aciculares dein pluriloculares, iucolores. Spermatia (quantum observ.) ex oblongo bacillaria; slcrigmatibus subsimplicibus. Thallus crustaceus, effiguratus aut uuil'ormis. Tlie genus is accepted here, generally, in the sense of Fries ; certain species, as those referable to Bceonii/ccs, and Hcterothecktm, being how- over excluded. It is exactly analogous to Lccancro, rujd, like this, exhibits, but in greater fullness and detail, the whole dlGbrentiatiou of the colourless spore. All the steps of this process are displayed also in the central group of most closely allied forms (modifications iu fact of but a single natural species according to Fries) of which B. vcrnaUs, B. sphoi- roides and B. rubella are well-known northern representatives. It is impossible to sunder, generically, these species, and rhe groups which they represent, by any differences beyond those based on, lud represent- ing the successive steps in the process of development of what is, at the bottom, the same spore. And ^'^-^ more or less arbitrary assemblages of species which we thus gain, U a'v !; ible now as subordinate divisions, are perhaps as often undesirable ! ij"Jc«,j^a in the continuity of the larger natural group, or genus. For the naturalness of this group, and the distinctness of the seri
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectlichens, bookyear1872
