. A guide to the study of lichens. 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 SPORES. PLATE Spore-types (con.). 73. Urceolaria. 74. Usnea. 75. Verrucaria. 76. Xylographa. GUIDE TO LICHENS. Schneider PUte XI. 73 ^0 ^ JM. SPORES.

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