76 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



8. Blade tips with 1-3 monosiphonous, multicellular hairs .... 



Taenioma 



8. Blade tips without hairs Platysiphonia 



9. At least younger thallus parts of a single layer of cells 10 



9. Polystromatic throughout Nienburgia 



10. Midrib lacking or faint 11 



10. Midrib present and very conspicuous 15 



11. All nerves and veins absent Haraldia 



11. Nerves and (or) veins present 12 



12. A faint midrib present, but side nerves and veins lacking 13 



12. Nerves running irregularly, anastomosing 14 



13. Sporangia in sori along the thallus margin .... Erythroglossum 



13. Sporangia in sori aggregated near the thallus tip Sorella 



14. Branching from the thallus margin Polyneura 



14. Branching from the lower, stripe parts ....Polyneurella 



15. Blades 5 mm. wide or more; sporangial sori scattered 



Phycodrys 



15. Blades 4 mm. wide or less; sporangial sori along the thallus 



margins Anisocladella 



16. Microscopic veins lacking 17 



16. Microscopic veins present 19 



17. Thalli minute, parasitic, the free parts terete Polycoryne 



17. Thalli not parasitic, with free blades 18 



18. Thalli with dichotomously branched main nerves 



Schizoseris 



18. Thalli without nerves or veins Myriogramme 



19. Thalli with frequent hamate branches Acrosorium 



19. Thalli without hamate branches 20 



20. Tetrasporangia developing both from the cortex and the 



axial filament; thalli 1-20 cm. tall, to 15 mm. broad 



Cryptopleura 



20. Tetrasporangia developing wholly from the cortex; thalli 

 10-30 cm. tall, 1-3 cm. broad Botryoglossum 



Branchioglossum undulatum Dawson 

 PI. 33, fig. 5-6 

 Dawson 1949, p. 18, Fig. 39-42; Dawson Neushul & Wildman 1960a, p. 24. 

 Thalli to 2 cm. high from a small, spreading, semi-clasping discoid 

 holdfast, consisting of several delicate, membranous blades arising from 

 the base, these sublanceolate in outline, 2-5 mm. broad, 1 or 2 times 

 pinnately branched (lobed) from the crisped or undulate margins; 

 midrib prominent; lateral veins present but inconspicuous; apices 

 obtuse; cystocarps abundant, on both surfaces of the blades along the 

 midrib and along main veins of lateral pinnae, projecting, hemispherical, 



