An introduction to the study of cryptogamous plants. In letters / By Kurt Sprengel ... Translated from the German.

  • Sprengel, Kurt Polycarp Joachim, 1766-1833.
Date:
1807
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to the study of cryptogamous plants. In letters / By Kurt Sprengel ... Translated from the German. Source: Wellcome Collection.

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    XV. CETERARIA (Fig. 101.), Disciform, thickish peltae, flatly adpressed, with free margin originating from the frond. The seminal layer appears to contain the seeds within tubes. The frond is lobate, with lobes very irregulär!y slit, mostly curled at the margin. This gen us is intermediate botween Pel- tidea and Parmelia: with the former of which'it might, perhaps, be united, did not the peltae, from their more rounded circum- ference, and greater thickness, approach to the nature of scutellae. To this genus belong L. nivalis, islandi- cus, j uniper inus. * XVI. USNEA (Fig, 83.), Round, flat, coriaceous, somewhat co- loured orbillse, furnished, on the lower surface only, with cortical substance, from which, however, they do not derive any margin ; nor have they a proper one. The 'seminal layer contains round, naked seeds, The