20 Algae. 
816 Baliostichus Sternb. 
817. Caulerpites Sternb 
Carpolithes Schlotb. pt. 
Fucoides Brongn. pt. 
818. Chondrites Sternb. 
819. Codites Sternb. 
820. Confervites Brongn. 
821. Cylindrites Göpp. 
822. Cystoseirites Sternb. 
823. Delesserites Sternb. 
824. Dictyotites Brongn. 
825. Encoelites Sternb. 
826. Fucites Brongn. 
827. Gigartinites Brongn. 
828. Gyrogonites Lam. 
829. Gyrophyllites Glock. 
830. Halymenites Sternb. 
Achilleum Goldf. 
Gastridiopsis Mass. 
Soleniopsis Ej. 
831. Halyserites Sternb. 
832. Keckia Glock. 
833. Laniinarites Sternb. 
834. Münsteria Sternb. 
835. Plocarites Massai. 
836. Rliodomelites Sternb. 
837. Sargassites Sternb. 
838. Sphaerococcites Sternb. 
Algacites Schloth. 
839. Zonarites Sternb. 
Class II. 
840. Arthonaria Fries. 
Artbronaria Endl. 
841. Cliostomum Fries. 
Cleiostomum Körb. 
842. Epilithia Nyl. 
843? Epinyctis Wallr. 
Nodularia Flörke. 
844. Inciliaria Fries. 
Incillaria Rchb. 
845. Isidium Ach. 
? Pityria Fries. 
846. Lepra Hall. 
Series I. 
Ordo 
852. Ephebe Fries. 
Thermutis Ej. 
853. Chroolepus Ag. 
- Amphiconiuni Nees. 
Trentepohlia Mart. pt. 
854 Byssus Fries. 
855. Ulocodium Massai. 
856. Coenogonium Ehr. 
Ordo 
Trib. 1. Lichineae. 
861. Gonionema Nyl. 
862. Lichina Ag. 
Lychiua Gray. 
Lichenes. 
imperfectae* 
(846.) Lepraria Ach. 
847. Naevia Fries. 
848. Pulveraria Ach. 
Pulina Adans. 
Phytoconis Bory. 
Leptuberia Raf. 
849. Pyrenothea Fries. 
Pyrenotea Ej. 
Gelatinaria Flörke. 
850. Spiloma Ach. 
851. Yariolaria Ach. 
Homoeomerlci. 
I. Byssacei. 
(856.) Caenogonium Kunth. 
? Dichonema Nees. 
857. Racodium Pers. 
Rhacodium Spreng. 
858 Cilicia Fries. 
859. Chrysothrix Mont. 
860? Gausapia Fries. 
II. Gelatinosi. 
863. Pterygium Nyl. 
Trib. 2. Obryzeae. 
864. Obryzum Wallr. 
