. The biology of flowering plants. Phanerogams; Plant physiology; Plant ecology; Plant Physiology. 242 THE BIOLOGY OF FLOWERING PLANTS with roots of other plants have been described in some cases, but this has not been confirmed by all investigators. In addition to the complete saprophytes one American species of Pyrola, Pyrola aphylla, with little chlorophyll, is a partial saprophyte. {d) Triuridaceas : this small family, with 3 genera and about 40 species, is exclusively tropical. All are small yellowish or reddish plants with scale leaves. {e) Burmanniaceae: another small tropical family, w
. The biology of flowering plants. Phanerogams; Plant physiology; Plant ecology; Plant Physiology. 242 THE BIOLOGY OF FLOWERING PLANTS with roots of other plants have been described in some cases, but this has not been confirmed by all investigators. In addition to the complete saprophytes one American species of Pyrola, Pyrola aphylla, with little chlorophyll, is a partial saprophyte. {d) Triuridaceas : this small family, with 3 genera and about 40 species, is exclusively tropical. All are small yellowish or reddish plants with scale leaves. {e) Burmanniaceae: another small tropical family, with its chief centre in Borneo and New Guinea, and with representatives in America. Most of the genera are com- pletely saprophytic ; Burmannia has auto- trophic and sapro- phytic species. One or two species are doubtfully parasitic. The family is remark- able for the extra- ordinary forms of its flowers (Fig. 29). Some species possess rhizomes which may be coral-like ; others produce shoots from the roots. (/) Orchidaceae. This great cosmopolitan family has more than 400 genera and 7000 species ; about 50 species, belonging to a dozen genera, are saprophytes, some only partial. It is likely that the family includes many other species of partially saprophytic habits : practically all harbour mycorhizal fungi. Three saprophytic species occur. Fig. 29.—Thismia Aseroe. Nat. size. (After Groom.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Skene, Macgregor. New York, The Macmillan Company
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