396 University of California Publications in Botany [Vol. 6 



placed either in sea water or in formaline immediately give up a 

 bright orange-colored pigment, whereas plants of Besa collected in the 

 same locality when treated likewise do not give up their pigment. It 

 seems best at present to keep the two genera separate awaiting further 

 evidence of connection or distinction. If tetraspores can be found 

 on papillae of Besa the question of the distinctness of the two genera 

 will be cleared up. 



The only other species of Hildenhrandtia known on the Pacific 

 coast of the United States with which H. occidentalis is at all likely 

 to be confused is the one that has passed under the name of H. proto- 

 typus Nardo. The thallus of H. prototypus is very much thinner, of 

 a rose-red color, the conceptacles shallower and the tetrasporangia 

 cruciately or irregularly obliquely divided. 



Hariot (1889, p. 81) has described a species, Hildenhrandtia Le 

 Cannellieri, from the vicinity of Cape Horn, which is the same as 

 //. occidentalis in the method of tetraspore formation, but is much 

 thicker, up to 8 mm. thick, has broad, flasked-shaped conceptacles and 

 has paraphyses. H. occidentalis has no paraphyses, but the concep- 

 tacles quite frequently' have slender, branched fungal hyphae in them. 



Coriophyllum Setehell et Gardner gen. nov. 



Thallus tenuis, coriaceus, expansus, plus minusve orbicularis fila- 

 mentis gracilibus dense intertextis sub piano medio thalli radianter 

 expansis horizontalibusque, supra et infra medium filamentis dense 

 aggregatis verticalibus et parce anastomosantibus in zonis compactis 

 compositus; in crassitudine per divisionem cellularum filamentorum 

 verticalium et in peripheria per divisionem cellularum strati medii 

 ad margines augens ; sporangia cruciate divisa in nematheciis vage 

 effusa et in magnitudine variabilibus paraphysibus comitata, ad super- 

 ficiem superam orienda ; antheridia et cystocarpia adhuc ignota. 



Thallus forming a thin, coriaceous expansion more or less circular 

 in outline and consisting of a tissue of fine, closely interwoven anas- 

 tomosing filaments extending radially through the thallus slightly 

 below its median plane ; this tissue gives rise to a zone of tissue above 

 and below consisting of a compact mass of fine, perpendicular, slightly 

 anastomosing filaments; increase in thickness is accomplished by divi- 

 sion of cells of the perpendicular filaments and in circumference by 

 division of cells of the median tissue at the periphery" ; tetrasporangia 

 with cruciate tetraspores are developed among paraphyses forming 

 nemathecia of indefinite shape and size on the upper surface ; an- 

 theridia and cystocarps unknown. 



