CHAPTER VIII. Systematic

SYSTEMATIC

I. CLASSIFICATION

A. WORK OF SUCCESSIVE SYSTEMATISTS 304 a. Dillenius and Linnaeus b. Acharius c. Schaerer d. Massalongo and Koerber e. Nylander f. Müller-Argau g. Reinke h. Zahlbruckner

B. FAMILIES AND GENERA OF ASCOLICHENS 311

C. HYMENOLICHENS 342

II. NUMBER AND DISTRIBUTION

1. ESTIMATES OF NUMBER

2. GEOGRAPHICAL DISTRIBUTION

A. GENERAL SURVEY 343

B. LICHENS OF POLAR REGIONS 345

C. LICHENS OF THE TEMPERATE ZONES 348

D. LICHENS OF TROPICAL REGIONS 352

III. FOSSIL LICHENS