226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



CATENELLA Greville, 1830 

 Gatenella repens (Lightfoot) Batters 



Plants creeping or pulvinate, the axes to 3 cm long, dull purple, dichot- 

 omous or trichotomous or in part pinnately branched, the branches seg- 

 mented, like the axis, the segments compressed, narrowly ellipsoid to 

 ovate; tetrasporangia in long acute segments; cystocarps in short, ovate 

 to subspherical segments. 



Taylor 1942, p. 103. 



Ecuador: Archipielago de Colon, from Rhizophora roots in a lagoon 

 near buildings. Academy Bay, I. Santa Cruz, no. 34-301 C, 20 Jan. 1934. 

 Esmeraldas, on roots of Rhizophora along the shore of Bahia San Fran- 

 cisco, no. 34-490B, 11 Feb. 1934. 



Gatenella impudica (Montagne) J. Agardh 

 Colombia: Valle, on mangroves at the mouth of the Rio Dagua, 

 Bahia Buenaventura, coll. E. P. Killip no. 33003, 3 Feb. 1939 (det. C. 

 K. Tseng) . 



Hypneaceae 



Plants bushy, cushionlike to large and virgate ; growing from an apical 

 cell and usually showing a persistent axial cell row, the cortex falsely 

 parenchymatous; tetrasporangia zonate, immersed at the surface of the 

 swollen parts of small lateral branchlets ; cystocarps showing gonimoblasts 

 associated with nutritive tissue within a swollen, poreless pericarp. 



HYPNEAKiitzing, 1813 

 KEY TO SPECIES 

 1. More or less matted or entangled 2 



1. Erect and bushy, very coarse, dark red, drying blackish . . . 

 H. Johnstonii 



2. Without characteristically elongated branches 3 



2. With some branches long, erect 5 



3. Small, densely matted H. spinella 



3. Loosely entangled 4 



4. Small, somewhat bushy to entangled H. cervicornis 



4. Larger but slender, caespitose but diffuse and loose H. Marchantae 



5. Small, densely matted, with erect fertile branches elongate . . 

 H. pannosa 



5. Large, somewhat entangled below, with little-divided virgate 



branches emergent for a few centimeters . . . . H. californica 



