. A guide to the study of lichens. S FOXES. PLATE IX. Generic Spore-types (con.)= 49. Parmelia. 50. Peltigera. 51. Pilophoron. 54. Placodium. 55. Polychidiuni. 56. ! Psoroma. 58. Pyrenula. 59. Pyxine. 60. Ramalina. GUIDE TO LICHENS Schneider. Plate rX. SPOKES. PLATE X. Generic Spore-types (con.). 61. Rinodina. 62. Rocella. 63. Solorina. 64. Sphaerophorus. 66. Stereocaulon. 67. Sticta. 68. Stictina. 69. Theloschistes. 70. Thelotrema. 71. Trypethelium. 72. Umbilicaria. GUIDE TO LICHENS Sahn^ider PJatt X.

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