104 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



KEY TO GENERA 



1. Branching alternate or irregular, progressive, without the forma- 

 tion of determinate branchlets Carpomitra 



1. Branching alternate in one degree along the single main axis, the 

 primary branches bearing numerous small determinate fertile 

 branchlets Sporochnus 



CARPOMITRA Kiitzing, 1842 



Carpomitra luxurians n. sp.^* 

 Plate 3, Figs. 9-16 ; Plate 16 ; Plate 17, Fig. 2 



Plants to over 47 cm tall, bushy; the holdfast to 1.3 cm diam., sub- 

 conical, stupose, giving rise to a very slender main stem which is also 

 stupose near the base; stem subcylindrical below, flattened above, about 

 0.5 mm diam. throughout except at the forks, where it is a little larger, 

 and in the ultimate branches where it is generally about 0.3 mm diam., 

 and rarely in any part reaches 1.3 mm diam.; to 380 fx thick; the branch- 

 ing alternate or, near the tips, pseudodichotomous, and where subtending 

 a fertile receptacle becoming opposite or verticillate, rebranching freely 

 at intervals of 0.5-5.0 cm, with little decrease in size between the succes- 

 sive divisions, the main axes deliquescent above and hardly distinguish- 

 able ; costa not externally distinguishable, represented in section by an ill- 

 defined axial cell row; growing tips of the branches terminated by lux- 

 uriant hair tufts, the hairs 5-7 mm long, to about 42 yu, diam.; fertile 

 receptacles terminating axes, conical, resting on disklike expansions of the 

 end of the axes, commonly becoming subtended by 1-3, most commonly 

 two branches, or these not developed and the receptacle then appearing 

 long pedicellate; paraphyses slender, 5.5 [x diam., with subspherical or 

 truncate terminal cells 18-28 {jl broad, 15-18 [jl long; sporangia 35-45 /x 

 long, 13-15 fi diam. 



These plants seem larger and much more slender than European C. 

 Cabrerae (Clem.) Kiitz., and most extra-European material attributed 

 to that species, although a specimen from "Port Philip Heads, J. Brace- 

 bridge Wilson 10. 1. 90," in Kew Herbarium was very similar. Material 

 from the Galapagos has been attributed to C. Cabrerae by Piccone (1886, 

 p. 40). 



_ '^•1 Carpomitra luxurians n. sp. — Planta altitudine maior 47 cm, fruticosa, 

 axibus subcylindricis et infra ad 0.5 mm diam., supra, autem, ramis planis, 0.3, 

 raro ad 1.3 mm latitudine; costa inconspicua; sporangiis 35-45 M' long., 13-15 n 

 diam. ; paraphysibus tenuibus, 5.5 \x diam., cellulis terminalibus sphaeroideis aut 

 truncatis, 18-28 M- diam., 15-19 n long. Planta typica in loco dicto Black Beach 

 Anchorage, I. Santa Maria, Ecuador, legit W. R. Taylor no. 24-285, 19 Jan. 1934. 



