134 DELESSERIACEAE 
spicuous elliptic sori, etc. The type is 12 cm. long, but it shows 
only the basal part of the broadest and probably originally the 
longest lobe. This remnant of the broadest lobe has a maximum 
width of 5 cm., while the other lobes are 1-1.5 cm. in greatest 
width. А midrib is recognizable only in the stipital region. The 
thallus is for the most part very thin and 2 or 3 cells thick, but 
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FIGURE 42. Photograph of two adherent fragments of the original material of 
Delesseria phylloloma Mont. now in the Montagne herbarium of the Muséum d'His 
toire Naturelle of Paris, reduced to about four fifths of the natural dimensions. 
toward the base it becomes more coriaceous and 80-110 и (4 or 5 
cells) thick. Attached to the basal part of the stipe, as shown Ш 
our photograph, is a plant of Callophyllis variegata. 
Delesseria phylloloma Mont. is represented in the Muséum 
