OF ARTS AND SCIENCES. 81 



antlieridiis 5-71onge pedicellatis ; paraphysibus paucis curtis ; foliis 

 perigon. late ovatis recurvo-apiculatis ecostatis sublimbatis. — Hab. 

 Vicinity of Valparaiso, Chili. 



" 23. Neckera tricostata (n. sp.) : dioica ? majuscula, fusco-lutes- 

 cens ; caule primario repente radiciformi subterraneo ramos erectos 

 inferne atratos defoliatos superne speciose dendroideo-rarnulosos emit- 

 tente, ramulis elongatis flexuosis simplicibus compositisve dense foliosis 

 fructiferis ; foliis erecto-patentibus incurviusculis e basi lata subtrun- 

 cata ovato-oblongis acuminatis concavis carinato-costatis, costa valida 

 cum apice desinente, toto ambitu incrassate limbatis veluti tricostatis 

 superne grosse serratis, cellulis compactis minutis subpunctiformibus ; 

 perichsetii oblongi foliis arete imbricatis, inferioribus subsquamBeformi- 

 orbiculatis, superioribus ad medium erectis oblongo-convolutaceis de- 

 hinc subito horizontaliter reflexis tenui-acuminatis, omnibus ecostatis 

 interrupte pellucide sublimbatis; archegoniis 45-50 paraphysibus 

 numerosis fere duplo longioribus 30 - septatis basi interdum composite 

 cellulatis ; castera desunt. — Hab. Forest at the eastern base of 

 Mauna Kea, Hawaii, Sandwich Islands. 



" 24. Rhizogonium pungens (n. sp. ) : dioicum ; caespite dense hispido 

 e viridi spadiceo ; caulibus bi-triuncialibus basi fructiferis erectiusculis 

 simplicibus inferne tomento atropurpureo dense vestitis ; foliis laxius- 

 cule dispositis patenti-divergentibus carinato-concavis semiuncialibus 

 (arista inclusa) strictiusculis rigidis pungentibus elliptico-lanceolatis 

 costa valida subtereti in aristam dorso et lateribus grosse dentatam 

 lamina quintuple longiorem excurrente instructis basi-valde incrassatis 

 e cellulis minutis densis subquadratis compositis, margine duplicato- 

 dentato vel potius bilamelloso, lamellis dentatis ; perichsetiis radicalibus 

 brevissime stipitatis ; foliis perichsetialibus exterioribus lanceolatis den- 

 tatis, interioribus oblongis integerrirnis, omnibus laxius reticulatis basi 

 vaginantibus costa excurrente valida dentata longissime aristatis ; arche- 

 goniis longiusculis numerosis (40 - 50) copiose paraphysatis, paraphysi- 

 bus 7— 10-septatis archegonia paululum superantibus. — Hab. District 

 of Puna, southwest coast of Hawaii, Sandwich Islands." 



Professor William B, Rogers called the attention of the 

 meeting to the different explanations which have been given 

 of the two vertical beams of light which are seen stretching, 

 the one upwards and the other downwards, from a luminous 



VOL. III. 11 



