59. 



L. 



60. 



L. 



61. 



L. 



62. 



L. 



No. 5] REVISED SYSTEM. SURVEY OF THE MELOBESIEAE. 15 



57. L. Lenormandi (Aresch.) Fosl. 



f. sublævis Fosl. 



f. typica. 



f. squarrulosa Fosl. (L. squarrulosum Norw. Lith.) 



58. L. læve (Stromf.) Fosl. 



f. macrospora Fosl. 



f. tenuis(Kjellm.)Fosl. (f. tenuissima Fosl.; L. tenue Kjellm.) 



californicum Fosl. 



scabriusculum Fosl. 



tenuissimum Fosl. 



myriocarpum Fosl. 



Subgen. II. Epilithon (Heydr.) Fosl. 



Thallus composed of a single laver of cells except in the 

 neighbourhood of the conceptacles. 



63. L. membranaceum (Esper) Fosl. 



64. L. corticiforme (Kiitz,) Fosl. (incl. Melobesia rosea (Kiitz.) 



Rosan.? Non Crn.; Hapalidium Hildenbrandtioides Crn.) 



Gen. Chætolithon Fosl. 



1898. List of Lith. 



Thallus parasitical, the hypothallic cells as rhizoids penetrate 

 the tissue of other ealcareous Algæ. 



Conceptacles of sporangia soriform, subimmersed; sporangia 

 between destructible walls, through gelinated at length loosening 

 tips corresponding with muciferous canals in the roof. 



Conceptacles of cystocarps unknown. 

 1. Ch. deformans (Solms) Fosl. 



Gen. Gomolithon Fosl. 



1898. List of Lith.l); emend. 



Conceptacles of sporangia superficial or subimmersed, conical, 

 with an elongated tip or constricted above The middle, this upper 

 part often falling away before maturity of the sporangia and then 



x ) Through mistake was in Syst. Surv. L. byssokles of Leiyidomorphum 

 placed as the type of the subgenus CladolitJton instead of G. moluccense. 



