LICHENES 



37 



the apothecia and spermogonia (pycnidia) is indicated in the figure. Asci and 

 paraphyses are both found in the apothecia, and eight one-celled ascospores 

 are contained in each ascus. The soredia of a species of Usnea are shown in 

 Fi g- 37- 



Fig. 36. Usnea florida (L.) Hoffm. 1. Plant. 2. Section through apothecium, 

 slightly enlarged. 3. Spores. 4. Fulcra and pycnoconidia. 5. Trans- 

 verse section of receptacle of pycnoconidia. (After Crombie) 3—5 much 

 enlarged. (3-4 after Reinke) 



• I? • ®a» 



%e 





37. Usnea barbata Fries Soredia. I. A single conidium, surrounded by hyphae. 

 2. Soredium with its conidia sub-divided several times. 3. Group of simple soredia, 

 which have been forced apart by the growth of the intervening hyphae. 4, 5. Growing 

 soredia, the hyphae having formed an apical thallus. x 500. (After Schwendener) 



INDEX OF THALLOPHYTES. 



Aecidium Euphorbiae Pers. Fig. 28 

 Ae. resinicolum (Rud.) Wint. PI 



Figs. 29, 30 

 Agaricaceae 29 



Amanita muscaria (L.) Pers. PI. 4 

 A. phalloides (Fries) Quelet 21, PI. 3 

 Anabaena Cycadearum 94 

 Anthurus MacOwani Marl. 22, PI. 3 



Synonyms are printed in italics. 



A. Woodii Kalchbr. & MacOw. 22 

 ; Ascomycetes 26 



Azotobacter 6 



Bacillus subtilis (Ehr.) Cohn Fig. 2 



Bacteria 4 



Basidiomycetes 28 



Boletus bovinus L. 23 



B. edulis Bulliard 23, PL 3 



