194 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



PLATE 11 



Figs. 1-2. Peyssoiulia iiuxuana Dawson. Fig. 1. Schematic repre- 

 sentation of a vertical section through a tetrasporansia! 

 thallus of the type, showing the thick perithallus of 

 ascending cell rows and the extensive, elevated nema- 

 thecium, X 77. Fig. 2. A paraphysis 133 |ii long from 

 the same specimen. 



Figs. 3-4. Peyssonelia pacifica Kylin. Fig. 3. Schematic repre- 

 sentation of n vertical section through a tetrasporangial 

 thallus from Point Fermin, Calif., showing the non- 

 elevated nemathecium and small sporangia, X 70. Fig. 

 4. A paraphysis 74 .u long from the same specimen. 



Figs. 5-6. Peyssonelia {/uadalupensis Dawson. Fig. 5. Schematic 

 representation of a vertical section through a tetra- 

 sporangial thallus of the type, showing the thick, 

 elevated nemathecium, large sporangia and multi- 

 cellular rhizoids, X 75. Fig. 6. A paraphysis 170 \i 

 long from the same specimen showing the catenate 

 upper cells. 



Figs. 7-8. Ethelia mexicana Dawson. Fig. 7. Schematic repre- 

 sentation of a vertical section through a tetrasporangial 

 portion of the type, showing both ascending and de- 

 sending portions of the perithallus, the sunken ne- 

 mathecia and small sporangia, X 46. Fig. 8. Schematic 

 representation of a vertical section cut radially through 

 the marginal part of the type, showing many pluricellu- 

 lar rhizoids and the development of the ascending and 

 descending perithallus cell rows from a horizontal 

 mesothallus, X 60. 



Fig. 9. Cninriella hancockii Dawson. Schematic representa- 



tion of a vertical section through a tetrasporangial 

 thallus of the type collection, showing the prominent 

 stratification of the thick thallus and a small, immersed 

 tetrasporangial nemathecium, X 64. 



Figs. 10-11. Peyssonelia clarionensis Taylor. Fig. 10. Schematic re- 

 presentation of a vertical section through the tetra- 

 sporangial type specimen, showing the elevated nema- 

 thecium and ascending perithallus cell rows, X 92. 

 Fig. 11. A paraphysis 110 |li long from the same speci- 

 men. 



Figs. 12-13. Peyssonelia eonehieola Pice. & Grun. Fig. 12. Schematic 

 representation of a vertical section through a tetra- 

 sporangial nemathecium of Howell 892, Bahia San 

 Lucas, Baja Calif., showing an elevated nemathecium 

 and the prominently ascending perithallus cell-rows, 

 X 156. Fig. 13. Two of the short, coarse paraphyses 

 (85 II long) from the same specimen. 



