[Vol. 2 

 50 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



ACROSTICHUM AUREUM L. 



Border of pool near Sardinera. Determined from barren leaf specimen: 

 Porto Rico; Hispaniola; Bahamas; Curacao. 



CYCLOPELTIS SEMI CORD ATA (Sw.) J. Smith 



Shaded limestone rocks, Sardinera: Porto Rico; Hispaniola. 



MUSCI 

 (Determined by Elizabeth G. Britton and R. S. Williams) 



THUIDIUM INVOLVENS (Hedw.) Mitt. 



On dead wood and shaded rocks: Porto Rico; Hispaniola. 



TORTULA AGRARIA Sw. 



On the ground near Sardinera: Porto Rico; Hispaniola; Bahamas. 



HYOPHILA GUADELUPENSIS Broth. 



Wet soil on the coastal plain between Sardinera and Ubero: Guadeloupe; 

 Montserrat. 



BRYUM MICRODECURRENS E. G. Britton 



Wet soil on the coastal plain between Sardinera and Ubero: St. Thomas. 



CALYMPERES RICHARDI C. Muell. 



On tree trunks, base of cliff, Sardinera: Porto Rico; Hispaniola; Bahamas. 



CALYMPERES (an apparently undescribed species) 

 On Bourreria, Ubero; Hispaniola. 



HEPATICAE 



JUNGERMANNIACEAE 

 (Determined by Professor A. W. Evans) 



BRACHIOLEJEUNEA BAHAMENSIS Evans 



On limestone, Ubero; on trunk of Gymnanthes, Sardinera: Bahamas. 



MASTIGOLEJEUNEA AURICULATA (Wils. & Hook.) Schiffn. 



On shaded limestone and on dead wood, Sardinera: Porto Rico; Bahamas. 



LEJEUNEA (barren and undeterminable) 



On shaded limestone, bark and dead wood. 



FRULLANIA SQUARROSA (R. B. & U.) Dumort. 



On trunks and logs on the coastal plain: Porto Rico; Bahamas. 



FRULLANIA (barren and undeterminable) 

 On dead wood, Sardinera. 



RICCIACEAE 

 (Contributed by Dr. Marshall Avery Howe) 



RICCIA BRITTONII, sp. nov. 



Thallus simple or once dichotomous, forming irregularly gregarious patches, 

 oblong-ovate, linguiform, or obovate, 2-5 mm. x 1-2 mm., subacute or obtuse, con- 

 spicuously alveolate-reticulate and light green above, with a scarious-albescent 

 border 80-175 fi wide, concolorous or very commonly brownish laterally and ven- 

 trally; median sulcus deep and acute except in older parts; ventral scales small, 

 inconspicuous, hyaline, rarely exceeding the thin membranous ascending thallus- 

 margins; transverse sections mostly 1.5-2.0 times as wide as high, the ventral 

 outlines semi-orbicular in younger parts, becoming flattened in the older; cells of 

 the primary dorsal epidermis cylindric dome-shaped or subhemispheric, soon col- 

 lapsing, leaving shallow slightly indurated more or less persistent cup-like 

 vestiges; monoecious; antheridial ostioles scarcely elevated; spores brown, be- 

 coming subopaque, soon exposed, 100-145 /ti in maximum diameter, rather ob- 



