PENICILLIUM EXPANSUM. 27 



to justify reviving the name /'. expansum Link and limiting it to the 

 penicillium i<>t <>l' apples alone. 



/'. expansum Link (in part), the penicillium rol of apples, would 

 therefore stand as the type species of the genus. 



The I cchnical rules for the establishment of type species arc in this 

 way satisfied. The kind of plant usa\ by Link is perfectly well 

 known. To sav jusl which forms he had in hand may be impossible, 

 hut the form we arc discussing was certainly one of them. 



EXPLANATION OF DRAWINGS. 



The drawings of the species described have been made with the 

 Bausch & Loml) camera lucid a in all cases except such as are marked 

 diagrammatic or partly diagrammatic. 



For those with the magnification of 1 10, the lenses \i^h\ were the 

 Bausch & Loml) 1-inch ocular and the two-thirds objective; for those 

 of 900 the lenses were the Bausch & Lomb 1-inch ocular and the one- 

 eighth objective; for those of 1,400 the lenses were the Bausch X 

 Loinh 1-inch ocular and the one-twelfth objective: for those of 1,600 

 the Spencer No. 12 compensating ocular and the Zeiss 3 mm. apert. 

 L30 apochromatic. This apochromatic was also used in a few cases 

 at a magnification of 900; these are indicated in the legends. All 

 figures at magnification of 140 were drawn from the exposed surface 

 of the undisturbed colony in Petri-dish cultures. All other figures 

 were made from fluid mounts or hanging-drop cultures (for spore 

 germinations). 



The series of sketches at 140 magnification are made with uniform 

 methods, so that comparison of species in culture can be much easier 

 than from figures made at different magnifications. 



PENICILLIUM EXPANSUM Link. 



P. expansum Link i in pari i, emended Thom=penicillium rol of apples and allied fruits. 



Syn. Coremium glaucum Link. Observations, p, L9; [cones, V, 0i^. 31, 1809. 

 Floccaria glauca Greville, Scottish Flora, pi. 301, 6gs. 1—1. 

 Penicillium glaucum Link (in part), Species Plantarum, VI (1824), p. 70. 

 Coremium vulgart Corda (in part), Prachtflora, p. 54, PI. XXV, especially 



figs. :;. I. 17. L8, L9, 20, and 21. 

 Possibly /'. thuiijiiiiiin Dierckx. 



Colonies upon gelatin and potato or bean agar, green becoming gray-green and 

 slowly brown in several weeks (especially when exposed tolighl I, fioccose, with concen- 

 tric zones tufted with short, louse, coreni i uni-like aggregations of conidiophores, not 

 over! 2 mm. in height except in old cultures containing sugar, broadlj spreading with 

 broad white margin in growing colonies. Reverse somewhal brown. Conidiophores 

 either very shorj lateral branches of aerial byphse or verylongi I ami. or more), aris- 

 ing singly or grouped with others to form coremia. Conidial fructifications consist 

 of 1 to :; main branches bearing verticils ofbranchlets supporting crowded whorls 

 of conidiiferous cells, 130-200 by 50 <><».*' at base in cultures without sugar, with sugar 



