. A guide to the study of lichens. cal, inner wall reticulate, 150/x X 47/*. This species, as well as other species of the genus,were formerly included among the PseudoUchenes orLichenes imperfecti, under the name of com. contains a large percentage of oxalate of limeand had been used in France as the source of oxalicacid. It was used as a remedy in feyers and as anastringent in intestinal troubles. Many Pertusariaswere more or less recommended in the dyeing industries. 1. Pertusaria velata. Thallus thick, areolate, light-gray. Apothecial warts bearing apothecia whichopen by apic
. A guide to the study of lichens. cal, inner wall reticulate, 150/x X 47/*. This species, as well as other species of the genus,were formerly included among the PseudoUchenes orLichenes imperfecti, under the name of com. contains a large percentage of oxalate of limeand had been used in France as the source of oxalicacid. It was used as a remedy in feyers and as anastringent in intestinal troubles. Many Pertusariaswere more or less recommended in the dyeing industries. 1. Pertusaria velata. Thallus thick, areolate, light-gray. Apothecial warts bearing apothecia whichopen by apical pores showing the pale disk. Sporesyery large, typical, but not reticulate, 180/x, X 65/x. 8. Dermatocarpon. The only representatiye of this genus which came tonotice is generally included in the genus Endocarpon. The thallus is yery minute for a foliose type. Care-ful search with a pocket lens is necessary to detect consists of a single entire lobe closely adnate to thesubstratum (rock) and is of a dark color. Several of. ILATK Ir. Cruslosc l^vpos. ihc i-(«ii»ii oi \.Y. Chirk in tlie liriliariiim nt ilir ( alifoiiiia Aiutleiiiy oiScieiii*. IertitsKriii vrlafn. GENERA AND SPECIES. 177 these minute lobes usually occur in close algje are Pleurococcus as in Verrucaria. The apothecia are very small, usually one is im-mersed in each thallus-lobe- Quite generally minutesingle-celled algse {^Pleurococcus^) occur above thethecium; these are known as thecial algse, and areejected with the spores and enter into a symbiotic re-lationship with the germinating spore. The sporesare colorless, multilocular, thus differing from those ofVerrucaria and Endocarpon. The only species occurs upon limestone, and seemsto be southern in its range. 1. Dermatocarpon pusillum. Thallus-lobes entire,minute, widely scattered, closely adnate to the substra-tum, dark. Apothecia typical of the genus. Sporestypical, two or three in each spore-sac, X 9. Endocar
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