By V. S. Summerhayes
A treasure for all fans of untamed vegetation -- Wild Orchids of england presents a close account of all our orchid species, types and hybrids, and has an invaluable key to identity. This variation is unique to newnaturalists.com Now released in booklet layout, with a whole set of recent distribution maps from the Atlas of the British plant life, this gorgeous e-book continues to be the traditional paintings in its topic, a treasure for all enthusiasts of untamed crops. Dr. Dummerhayes, in control of the orchid assortment at Kew from 1924 to 1964, seems at our fifty-odd species on the subject of the sizeable orchid relatives in the course of the global, discusses their normal biology and typical historical past in Britain, supplies a close account of all our orchid species, forms and hybrids, and offers an invaluable key to identity. the color pictures symbolize each recognized British species aside from Orchis cruenta and O. occidentalis.
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Extra info for Wild Orchids of Britain (Collins New Naturalist Library, Volume 19)
Example text
Variation in the frequencies of cytoplasmic and nuclear-associated microtubules is also reported. In Lagena each flagellum appears to be rotated clockwise between 90-180°, 'winding up' the Rl and R3 (MS) roots. By way of contrast, a striated, fibrous root (sometimes termed a rhizoplast), is a prominent feature in Rozella (Held, 1975), and this structure is also found in Chytridiomycetes and the choanoflagellates. The structure and mechanism is distinct from the ultrastructural morphology described above.
2B-D) by permission of Academic Press . 27 CRITERIA FOR DIAGNOSES + ". :- +- ··~: CS ? )Z . \( . .. a ) >== = + ;:t======-;81-====::( + + c b e FIGURE I: S. Hypothesis for the strucrural conservation and mode of function of the rubular tripanite hair (TIH). The theoretical problem is that, for the straminipilous flagellum to function in the way it has been observed to do, the TrHs must be held stiffly in the plane of the quasi-sinusoidal wave , yet they do not appear to have any strucrural mechanism to achieve this, panicularly in view of the hydrodynamic stresses to which they are exposed .
Aist & Williams (1971), Barr & Allen (1982), Clay & Walsh (1990, 1997), Miller, Martin & Dylewski (1985) and Talley, Miller & Braselton (1978) have described the ultrastructure of the plasmodiophoraceous zoospore, and it is clear that the flagellar apparatus differs considerably from that of the peronosporomycetes. A fine transitional plate extends across the axoneme core at a point level with the cell piasmamembrane, but it does not extend to this membrane nor does it have a bead-like projection at its centre.