. The Bryologist. Mosses; Liverworts; Lichens; Botany; Bryology. — 70 — The genus is distinguished from ParmeHa by a purely technical character. In the spermagonia of ParmeHa, the spermatia are borne laterally from joints of the sterigmata ("fulkren endobasidial" of Zahl- bruckner, see text-figure 2) while in Parmeliopsis the spermatia are terminal only ("fulkren exo- basidial," see text-figure i). This distinction would be of doubtful generic value if it were not for the fact that these species ob- viously form a natural group, Sterigmata and spermatia of Parmeliopsis (fig
. The Bryologist. Mosses; Liverworts; Lichens; Botany; Bryology. — 70 — The genus is distinguished from ParmeHa by a purely technical character. In the spermagonia of ParmeHa, the spermatia are borne laterally from joints of the sterigmata ("fulkren endobasidial" of Zahl- bruckner, see text-figure 2) while in Parmeliopsis the spermatia are terminal only ("fulkren exo- basidial," see text-figure i). This distinction would be of doubtful generic value if it were not for the fact that these species ob- viously form a natural group, Sterigmata and spermatia of Parmeliopsis (fig. i) and not conveniently classified with P^rmelia (fig. 2). Semi-diagrammatic, either Parmelia or Cetraria. It is an advantage, therefore, to have a name to designate the group, and Zahlbruckner (Engler and Prantl: Die Natiirlichen Pflanzenfamilien, Teil I, Abteilung I,* p. 209, 1905) has accepted Nylander's name and conception of the group. The generic name to be used is, however, of less importance than the question of the specific names. But before discussing the nomenclature it will be well to have in mind the distinctive characters of the plants that are to be considered. There are four species, all foliose, and more or less closely appressed to the fence- rails, or to the bark of conifers upon which they grow: A. A lichen with gray upper side, whitish under side, radiating lobes, and en- tirely free from isidia or soredia (Plate XX, fig. i). B. A lichen with gray upper side, whitish under side, occurring in two forms: the typical form with radiate lobes and dense isidia (Plate XX, fig. 2), and a variety with irregular lobes and scattered isidia (Plate XX, fig. 3). C. A lichen with gray, often dirty-looking, upper side, and dark (castaneous to black) under side, with radiate lobes and powdery white soredia (Plate XX, fig. 5). D. A lichen with straw-colored or sulphury upper side, dark (castaneous to black) under side, more or less radiate lobes, and soredia which are
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, booksubjectli
