380 herre: lichen flora 



intensities fluctuated alternately above and below the highest 

 clear sky records obtained at Madison during June. 



By way of contrast, it may be stated that frequently during 

 the prevalence of thunderstorms the dense cloud masses reduce 

 the recorded radiation intensity to less than 1 per cent of clear 

 sky intensities. 



Summary, The records from Callendar recording pyrhelio- 

 meters show that with favorable conditions of sun and clouds the 

 intensity of the vertical component of the radiation received from 

 the sun and sky may be at least 40 per cent in excess of what would 

 have been recorded had the sky been free from clouds, and that 

 an excess of 10 per cent is quite common. In consequence partial 

 cloudiness may diminish but slightly the amount of radiation 

 received at the surface of the earth. 



BOTANY. — Supplement to the Lichen flora of the Santa Cruz 

 Peninsula, California. Albert W. C. T. Herre. 



Some years ago in a paper on lichen distribution in the Santa 

 Cruz peninsula, I expressed the belief that there were probably 

 200 species and subspecies of lichens in that region. Later in 

 my lichen flora of the Santa Cruz peninsula I described in detail 

 307 species and subspecies, and diagnosed or mentioned 25 others 

 which I did not deem worthy of very distinct separation. At 

 the same time I stated that this number would be raised materi- 

 ally upon further investigation, and it is my present belief that 

 the lichen flora of the Santa Cruz peninsula comprises not less 

 than 400 good species and subspecies, generally recognized as 

 true lichens. In this estimate no cognizance is taken of those 

 forms (such as the parasitic Buellias of authors) usually described 

 in lichen floras, but which in my judgment are true fungi. If 

 in addition one were to include the lichens of the coast about 

 Monterey, and those of the inner Coast Range near San Jose, 

 including Mt. Hamilton and Alum Rock Park, the number would 

 easily be raised to 500. 



The greater number of my as yet undecipherable specimens 

 belong to the genera Buellia, Pannaria, and Rhizocarpon. The 



